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Saturday, January 24, 2015

Meet the honor brigade, an organized campaign to silence debate on Islam

January 16
 
Asra Q. Nomani, a former Wall Street Journal reporter, is the author of “Standing Alone: An American Woman’s Struggle for the Soul of Islam.”

Original link:   http://www.washingtonpost.com/opinions/meet-the-honor-brigade-an-organized-campaign-to-silence-critics-of-islam/2015/01/16/0b002e5a-9aaf-11e4-a7ee-526210d665b4_story.html

“You have shamed the community,” a fellow Muslim in Morgantown, W.Va., said to me as we sat in a Panera Bread in 2004. “Stop writing.”
 
Then 38, I had just written an essay for The Washington Post’s Outlook section arguing that women should be allowed to pray in the main halls of mosques, rather than in segregated spaces, as most mosques in America are arranged. An American Muslim born in India, I grew up in a tolerant but conservative family. In my hometown mosque, I had disobeyed the rules and prayed in the men’s area, about 20 feet behind the men gathered for Ramadan prayers.

Later, an all-male tribunal tried to ban me. An elder suggested having men surround me at the mosque so that I would be “scared off.” Now the man across the table was telling me to shut up.
“I won’t stop writing,” I said.

It was the first time a fellow Muslim had pressed me to refrain from criticizing the way our faith was practiced. But in the past decade, such attempts at censorship have become more common. This is largely because of the rising power and influence of the “ghairat brigade,” an honor corps that tries to silence debate on extremist ideology in order to protect the image of Islam. It meets even sound critiques with hideous, disproportionate responses.

The campaign began, at least in its modern form, 10 years ago in Mecca, Saudi Arabia, when the Organization of Islamic Cooperation — a mini-United Nations comprising the world’s 56 countries with large Muslim populations, plus the Palestinian Authority — tasked then-Secretary General Ekmeleddin Ihsanoglu with combating Islamophobia and projecting the “true values of Islam.” During the past decade, a loose honor brigade has sprung up, in part funded and supported by the OIC through annual conferences, reports and communiques. It’s made up of politicians, diplomats, writers, academics, bloggers and activists.

In 2007, as part of this playbook, the OIC launched the Islamophobia Observatory, a watchdog group based in Jiddah, Saudi Arabia, with the goal of documenting slights against the faith. Its first report, released the following year, complained that the artists and publishers of controversial Danish cartoons depicting the prophet Muhammad were defiling “sacred symbols of Islam . . . in an insulting, offensive and contemptuous manner.” The honor brigade began calling out academics, writers and others, including former New York police commissioner Ray Kelly and administrators at a Catholic school in Britain that turned away a mother who wouldn’t remove her face veil.

“The OIC invented the anti-‘Islamophobia’ movement,” says Zuhdi Jasser, president of the American Islamic Forum for Democracy and a frequent target of the honor brigade. “These countries . . . think they own the Muslim community and all interpretations of Islam.”

Alongside the honor brigade’s official channel, a community of self-styled blasphemy police — from anonymous blogs such as LoonWatch.com and Ikhras.com to a large and disparate cast of social-media activists — arose and began trying to control the debate on Islam. This wider corps throws the label of “Islamophobe” on pundits, journalists and others who dare to talk about extremist ideology in the religion. Their targets are as large as Israeli Prime Minister Benjamin Netanyahu and as small as me.

The official and unofficial channels work in tandem, harassing, threatening and battling introspective Muslims and non-Muslims everywhere. They bank on an important truth: Islam, as practiced from Malaysia to Morocco, is a shame-based, patriarchal culture that values honor and face-saving from the family to the public square. Which is why the bullying often works to silence critics of Islamic extremism.

“Honor brigades are wound collectors. They are couch jihadis,” Joe Navarro, a former supervisory special agent in the FBI’s behavioral analysis unit, tells me. “They sit around and collect the wounds and injustices inflicted against them to justify what they are doing. Tragedy unites for the moment, but hatred unites for longer.”

In an e-mail exchange, the OIC’s ambassador to the United Nations denied that the organization tries to silence discussion of problems in Muslim communities.

The attacks are everywhere. Soon after the Islamophobia Observatory took shape, Sheik Sabah Ahmed al-Sabah, the emir of Kuwait, grumbled about “defamatory caricatures of our Master and Prophet Muhammad” and films that smear Islam, according to the OIC’s first Islamophobia report.

The OIC helped give birth to a culture of victimization. In speeches, blogs, articles and interviews widely broadcast in the Muslim press, its honor brigade has targeted pundits, political leaders and writers — from TV host Bill Maher to atheist author Richard Dawkins — for insulting Islam. Writer Glenn Greenwald has supported the campaign to brand writers and thinkers, such as neuroscientist and atheist Sam Harris, as having “anti-Muslim animus” just for criticizing Islam.

“These fellow travelers have made it increasingly unpleasant — and even dangerous — to discuss the link between Muslim violence and specific religious ideas, like jihad, martyrdom and blasphemy,” Harris tells me.

Noticing the beginnings of this trend in December 2007, a U.S. diplomat in Istanbul dispatched a cable to the National Security Council, the CIA, the Defense Intelligence Agency and various State Department offices. The cable said the OIC’s chief called supporters of the Danish cartoons of Muhammad “extremists of freedom of expression” and equated them with al-Qaeda.

Most of the criticism takes place online, with anonymous bloggers targeting supposed Islamophobes. Not long after the cable, a network of bloggers launched LoonWatch, which goes after Christians, Jews, Hindus, atheists and other Muslims. The bloggers have labeled Somali author Ayaan Hirsi Ali, a born Muslim but now an atheist opponent of Islamic extremism, an “anti-Muslim crusader.” Robert Spencer, a critic of extremist Islam, has been called a “vicious hate preacher” and an “Internet sociopath.” The insults may look similar to Internet trolling and vitriolic comments you can find on any blog or news site. But they’re more coordinated, frightening and persistent.

One prominent target of the honor brigade’s attacks was Charlie Hebdo, the French newspaper where several staffers were recently killed by Islamic extremists. According to some accounts, as the killers massacred cartoonists, they shouted: “We have avenged the prophet Muhammad.” The OIC denounced the killings, but in a 2012 report, it also condemned the magazine’s “Islamophobic satires.” Its then-secretary general, Ihsanoglu, said the magazine’s “history of attacking Muslim sentiments” was “an outrageous act of incitement and hatred and abuse of freedom of expression.”

Charlie Hebdo is not the only evidence that, to self-appointed defenders of the faith, a call to kill the message can very easily become a plan to kill the messenger. In January 2011, a security officer for the governor of Pakistan’s Punjab province, Salman Taseer, assassinated him after Taseer defended a Christian woman accused of blasphemy. In court, supporters laid flowers on the shoulders of the assassin in approval.

Murderers like him would be much harder to radicalize in a climate that welcomed debate about Islam rather than seeking revenge on its critics. But in so many Muslim communities now, saving face trumps critical thinking and truth-telling. This is why reform from within Islam is so difficult. In my experience, if you try to hold the community accountable, you’re more likely to be bullied and intimidated than taken seriously.

When Rupert Murdoch recently tweeted, “Maybe most Moslems peaceful, but until they recognize and destroy their growing jihadist cancer they must be held responsible,” he was criticized for indelicately saying all Muslims were responsible for the acts of a few. But I do believe we bear collective responsibility for the problems in our communities.

After my threatening meeting at Panera, I kept advocating for women’s rights in the mosque and in the bedroom. Among other things, I argued that Muslim women have the right to orgasm, an intimacy too often denied in societies with a tradition of female genital mutilation.

Then came the death threats. In the fall of 2004, my parents and my son picked me up after I spoke at a conference. “Somebody wants to kill you,” my father said from behind the wheel of our gold Dodge Caravan, his voice trembling. The death threat was posted on Muslim WakeUp!, a now-defunct progressive Web site. The offender told the FBI that he would stop harassing me, and he did. More prosaic taunts in the past decade have called me a “Zionist media whore,” a “House Muslim” and many other unprintable insults.

Two years ago, Zainab Al-Suwaij, executive director of the American Islamic Congress, was so battered by online attacks aimed at silencing her that she experienced a physical response to the stress and anxiety, and ended up in an emergency room. When I met her in her office near the White House, she pulled up her sleeves to show me the marks left by IV injections that the hospital staff had administered to get her necessary fluids.

“The attacks just killed me,” Al-Suwaij said, wearily.

Bullying this intense really works. Observant members of the flock are culturally conditioned to avoid shaming Islam, so publicly citing them for that sin often has the desired effect. Non-Muslims, meanwhile, are wary of being labeled “Islamophobic” bigots. So attacks against both groups succeed in quashing civil discourse. They cause governments, writers and experts to walk on eggshells, avoiding important discussion.

For my part, I have continued to write, calling on American Muslims to root out extremism in our communities and arguing that certain passages of the Koran are too antiquated for our times. As I see it, the injunction to “stand out firmly for justice even against . . . your kin” is our divine “See something, say something” mandate. But too often, this passage is misused as a justification for attacking our own.

While we still have a long way to go, I have seen progress since I started calling for women’s rights in mosques and challenging the extremism I saw in American Muslim communities. Our mosque in Morgantown, a mostly male congregation, elected its first female president a few years ago, and she was largely accepted as a leader. But most women still shuffle through the back door and pray in a separate balcony.

Four years ago, the Muslim Public Affairs Council, an advocacy group, announced programs to discuss “taboo topics” such as homosexuality, interfaith marriage and extremism. Recently, young Muslim leaders in Northern Virginia started an initiative to create mosques that promote assimilation, interfaith harmony and women’s rights. Later this month, a new group, the Women’s Mosque of America, will hold a female-led prayer service in Los Angeles, a rare event in Muslim communities.

Next month, the Obama administration will hold a conference on challenging violent extremism, and President Obama last year called on Muslim communities to “explicitly, forcefully and consistently reject the ideology of al-Qaeda and ISIL.” But his administration isn’t framing extremism as a problem directly tied to Islam. Last month, by contrast, Egyptian President Abdel Fatah al-Sissi acknowledged that there was an ideology problem in Islam and said, “We need to revolutionize our religion.”

When I heard Sissi’s words, I thought: Finally.

Beyond these statements, though, we need a new interpretation of Islamic law in order to change the culture. This would require rejecting the eight schools of religious thought that dominate the Sunni and Shiite Muslim world. I propose naming a new one after ijtihad, the concept of critical thinking, and elevating self-examination over toxic shame-based discourse, laws and rules. Such a project could take the power out of the hands of the status quo clerics, politicians and experts and replace it with a progressive interpretation of faith motivated not by defending honor but acting honorably.

New research re-creates planet formation, super-Earths and giant planets in the laboratory

Original link:  https://www.llnl.gov/news/new-research-re-creates-planet-formation-super-earths-and-giant-planets-laboratory

science magazine
 
New laser-driven shock compression experiments on stishovite, a high-density form of silica, provide thermodynamic and electrical conductivity data at unprecedented conditions and reveal the unusual properties of rocks deep inside large exoplanets and giant planets. Photo by E. Kowaluk, LLE.

New laser-driven compression experiments reproduce the conditions deep inside exotic super-Earths and giant planet cores, and the conditions during the violent birth of Earth-like planets, documenting the material properties that determined planet formation and evolution processes.

The experiments, reported in the Jan. 23 edition of Science, reveal the unusual properties of silica — the key constituent of rock — under the extreme pressures and temperatures relevant to planetary formation and interior evolution.

Using laser-driven shock compression and ultrafast diagnostics, Lawrence Livermore National Laboratory (LLNL) physicist Marius Millot and colleagues from Bayreuth University (Germany), LLNL and the University of California, Berkeley were able to measure the melting temperature of silica at 500 GPa (5 million atmospheres), a pressure comparable to the core-mantle boundary pressure for a super-Earth planet (5 Earth masses), Uranus and Neptune. It also is the regime of giant impacts that characterize the final stages of planet formation.

“Deep inside planets, extreme density, pressure and temperature strongly modify the properties of the constituent materials,” Millot said. “How much heat solids can sustain before melting under pressure is key to determining a planet’s internal structure and evolution, and now we can measure it directly in the laboratory.”

In combination with prior melting measurements on other oxides and on iron, the new data indicate that mantle silicates and core metal have comparable melting temperatures above 300-500 GPa, suggesting that large rocky planets may commonly have long-lived oceans of magma – molten rock – at depth. Planetary magnetic fields can be formed in this liquid-rock layer.

“In addition, our research suggests that silica is likely solid inside Neptune, Uranus, Saturn and Jupiter cores, which sets new constraints on future improved models for the structure and evolution of these planets,” Millot said.

Those advances were made possible by a breakthrough in high-pressure crystal growth techniques at Bayreuth University in Germany. There, Natalia Dubrovinskaia and colleagues managed to synthesize millimeter-sized transparent polycrystals and single crystals of stishovite, a high-density form of silica (SiO2) usually found only in minute amounts near meteor-impact craters.

Those crystals allowed Millot and colleagues to conduct the first laser-driven shock compression study of stishovite using ultrafast optical pyrometry and velocimetry at the Omega Laser Facility at the University of Rochester’s Laboratory for Laser Energetics.

“Stishovite, being much denser than quartz or fused-silica, stays cooler under shock compression, and that allowed us to measure the melting temperature at a much higher pressure,” Millot said. “Dynamic compression of planetary-relevant materials is a very exciting field right now. Deep inside planets hydrogen is a metallic fluid, helium rains, fluid silica is a metal and water may be superionic.”

In fact, the recent discovery of more than 1,000 exoplanets orbiting other stars in our galaxy reveals the broad diversity of planetary systems, planet sizes and properties. It also sets a quest for habitable worlds hosting extraterrestrial life and shines new light on our own solar system. Using the ability to reproduce in the laboratory the extreme conditions deep inside giant planets, as well as during planet formation, Millot and colleagues plan to study the exotic behavior of the main planetary constituents using dynamic compression to contribute to a better understanding of the formation of the Earth and the origin of life.

Co-authors on this paper include David  Braun, Peter Celliers, Gilbert  Collins and Jon Eggert of LLNL; Natalia Dubrovinskaia, Ana Černok, Stephan Blaha and Leonid Dubrovinsky of Bayreuth University; and Raymond Jeanloz of the University of California, Berkeley.

Martin Rees: Robots can enrich humanity - as long as we can keep them under control

The technology of artificial intelligence is advancing rapidly – but how will we cope with people-like machines more intelligent than us?

Science fiction or the future? the distinction between humans and robots could become blurred
Updated: 15:00, 23 January 2015
Original link:  http://www.standard.co.uk/comment/martin-rees-robots-must-abide-by-laws--or-humans-could-become-extinct-9998203.html 

Way back in 1942, the great science fiction writer Isaac Asimov formulated three laws that robots should obey. First, a robot may not injure a human being or, through inaction, allow a human being to come to harm. Second, a robot must obey the orders given it by human beings, except where such orders would conflict with the First Law. Third, a robot must protect its own existence as long as such protection does not conflict with the First or Second Law.

Seven decades later, intelligent machines pervade popular culture — most recently in the movie Ex Machina. But, more than that, the technology of artificial intelligence (AI) is advancing so fast that there’s already intense debate on how Asimov’s laws can be implemented in the real world.

Experts differ in assessing how close we are to human-level robots: will it take 20 years, 50 years, or longer? And philosophers debate whether “consciousness” is special to the wet, organic brains of humans, apes and dogs — so that robots, even if their intellects seem superhuman, will still lack self-awareness or inner life. But there’s agreement that we’re witnessing a momentous speed-up in the power of machines to learn, communicate and interact with us — which offers huge benefits but has downsides we must strive to avoid.

There is nothing new about machines that can surpass mental abilities in special areas. Even the pocket calculators of the 1970s could do arithmetic better than us.

Computers don’t learn like we do: they use “brute force” methods. Their internal network is far simpler than a human brain but they make up for this disadvantage because their “nerves” and neurons transmit messages electronically at the speed of light — millions of times faster than the chemical transmission in human brains. Computers learn to translate from foreign languages by reading multilingual versions of (for example) millions of pages of EU documents (they never get bored!). They learn to recognise dogs, cats and human faces by crunching through millions of images — not the way a baby learns.

Because computers can process huge amounts of data, they can identify trends that unaided humans would overlook. This is how “quant” hedge-funds make their money. Perhaps we should already worry that future “hyper computers”, analysing all the information on the internet, could achieve oracular powers that offer their controllers ever-growing dominance of international finance and strategy.

Advances in software and sensors have been slower than in number-crunching capacity. Robots are still clumsy compared with a child in moving pieces on a real chessboard. But sensor technology, speech recognition, information searches and so forth are advancing apace.

Google’s driverless car has already covered hundreds of thousands of miles. It will be years before robots can cope with emergencies as well as a good driver. But it will be better than the average driver — machine errors may occur  but not as often as human error. The roads will be safer. But when accidents occur they will create a legal minefield. Who should be held responsible — the “driver”, the owner, or the designer?

And what about the military use of “dumb” autonomous robots? Can they be trusted to seek out a targeted individual via facial recognition and decide whether to fire their weapon? Who has the moral responsibility then?

Robots are replacing people in manufacturing plants. And they will take over more of our jobs — not just manual work (indeed jobs such as plumbing and gardening will be among the hardest to automate), but clerical jobs, routine legal work, medical diagnostics and operations. But the big question is this: will the advent of robotics be like earlier disruptive technologies — the car, for instance, which created as many jobs as it destroyed? Or is it really different this time as has been argued, for instance in Erik Brynjolfsson and Andrew McAfee’s fine book, The Second Machine Age.

These innovations would generate huge wealth, but there would need to be massive redistribution via taxation to ensure that everyone had at least a living wage. Moreover, a life of leisure — as available, for instance, to the citizens of Qatar today — doesn’t necessarily lead to a healthy society.

By 2050, if not sooner, our society will surely have been transformed by robots. But will they be idiot savants or will they display full human capabilities? If robots could observe and interpret their environment as adeptly as we do, they would be perceived as intelligent beings that we could relate to. Would we then have a responsibility to them?

And this is where Asimov’s laws come in. How can we ensure that robots remain docile rather than “going rogue”? What if a hyper-computer developed a mind of its own? It could infiltrate the internet and manipulate the rest of the world. It might even treat humans as an encumbrance.

In the 1960s the British mathematician I J Good — who worked at Bletchley Park with Alan Turing — pointed out that a super-intelligent robot (were it sufficiently versatile) could be the last invention that humans need ever make. Once machines have surpassed human capabilities, they could themselves design and assemble a new generation of even more powerful ones. Or could humans transcend biology by merging with computers, maybe losing their individuality and evolving into a common consciousness?

We don’t know where the boundary lies between what may happen and what will remain science fiction. But some of those with the strongest credentials think that the AI field already needs guidelines for “responsible innovation”. Many of them were among the signatories — along with anxious non-experts like me — of a recent open letter on the need to ensure responsible innovation in AI.

In later writings, Asimov added a fourth law: a robot may not harm humanity, or by inaction allow humanity to come to harm. Perhaps AI developers will need to be mindful of that law as well as the other three.

Martin Rees is Astronomer Royal and co-founder of the Centre for Study of Existential Risks at Cambridge University.

Golden Rice


From Wikipedia, the free encyclopedia
 
Golden rice (far) compared to white rice (near)

Golden rice is a variety of Oryza sativa produced through genetic engineering to biosynthesize beta-carotene, a precursor of vitamin A, in the edible parts of rice.[1] The research was conducted with the goal of producing a fortified food to be grown and consumed in areas with a shortage of dietary vitamin A,[2] a deficiency which is estimated to kill 670,000 children under the age of 5 each year.[3]

Golden rice differs from its parental strain by the addition of three beta-carotene biosynthesis genes. The scientific details of the rice were first published in Science in 2000,[1] the product of an eight-year project by Ingo Potrykus of the Swiss Federal Institute of Technology and Peter Beyer of the University of Freiburg. At the time of publication, golden rice was considered a significant breakthrough in biotechnology, as the researchers had engineered an entire biosynthetic pathway.

In 2005, a new variety called Golden Rice 2, which produces up to 23 times more beta-carotene than the original golden rice, was announced.[4] Although golden rice was developed as a humanitarian tool, it has met with significant opposition from environmental and anti-globalization activists. Studies have found that golden rice poses "no risk to human health", and multiple field tests have taken place with no adverse side-effects to participants.[5]
A simplified overview of the carotenoid biosynthesis pathway in golden rice. The enzymes expressed in the endosperm of golden rice, shown in red, catalyze the biosyntheis of beta-carotene from geranylgeranyl diphosphate. Beta-carotene is assumed to be converted to retinal and subsequently retinol (vitamin A) in the animal gut

Golden rice was designed to produce beta-carotene, a precursor of vitamin A, in the edible part of rice, the endosperm. The rice plant can naturally produce beta-carotene in its leaves, where it is involved in photosynthesis. However, the plant does not normally produce the pigment in the endosperm, where photosynthesis does not occur. A key breakthrough was the discovery that a single phytoene desaturase gene (bacterial CrtI) can be used to produce lycopene from phytoene in GM tomato, rather than having to introduce the multiple carotene desaturases that are normally used by higher plants.[6] Lycopene is then cyclized to beta-carotene by the endogenous cyclase in Golden Rice.[7]

Golden rice was created by transforming rice with only two beta-carotene biosynthesis genes:
  1. psy (phytoene synthase) from daffodil (Narcissus pseudonarcissus)
  2. crtI (carotene desaturase) from the soil bacterium Erwinia uredovora
(The insertion of a lcy (lycopene cyclase) gene was thought to be needed, but further research showed it is already being produced in wild-type rice endosperm.)

The psy and crtI genes were transformed into the rice nuclear genome and placed under the control of an endosperm-specific promoter, so they are only expressed in the endosperm. The exogenous lcy gene has a transit peptide sequence attached so it is targeted to the plastid, where geranylgeranyl diphosphate formation occurs. The bacterial crtI gene was an important inclusion to complete the pathway, since it can catalyze multiple steps in the synthesis of carotenoids up to lycopene, while these steps require more than one enzyme in plants.[8] The end product of the engineered pathway is lycopene, but if the plant accumulated lycopene, the rice would be red. Recent analysis has shown the plant's endogenous enzymes process the lycopene to beta-carotene in the endosperm, giving the rice the distinctive yellow color for which it is named.[9] The original golden rice was called SGR1, and under greenhouse conditions it produced 1.6 µg/g of carotenoids.

Subsequent development

Golden rice has been bred with local rice cultivars in the Philippines[10] and Taiwan and with the American rice cultivar 'Cocodrie'.[11] The first field trials of these golden rice cultivars were conducted by Louisiana State University Agricultural Center in 2004.[11] Field testing provides a more accurate measurement of nutritional value and enables feeding tests to be performed.
Preliminary results from the field tests have shown field-grown golden rice produces 4 to 5 times more beta-carotene than golden rice grown under greenhouse conditions.[12]

In 2005, a team of researchers at biotechnology company, Syngenta, produced a variety of golden rice called "Golden Rice 2". They combined the phytoene synthase gene from maize with crt1 from the original golden rice. Golden rice 2 produces 23 times more carotenoids than golden rice (up to 37 µg/g), and preferentially accumulates beta-carotene (up to 31 µg/g of the 37 µg/g of carotenoids).[4] To receive the Recommended Dietary Allowance (RDA), it is estimated that 144 g of the most high-yielding strain would have to be eaten. Bioavailability of the carotene from golden rice has been confirmed and found to be an effective source of Vitamin A for humans.[13][14][15]

In June 2005, researcher Peter Beyer received funding from the Bill and Melinda Gates Foundation to further improve golden rice by increasing the levels of or the bioavailability of pro-vitamin A, vitamin E, iron, and zinc, and to improve protein quality through genetic modification.[16][17]

Potential use to combat vitamin A deficiency

Prevalence of vitamin A deficiency. Red is most severe (clinical), green least severe. Countries not reporting data are coded blue

The research that led to golden rice was conducted with the goal of helping children who suffer from vitamin A deficiency (VAD). In 2005, 190 million children and 19 million pregnant women, in 122 countries, were estimated to be affected by VAD.[18] VAD is responsible for 1–2 million deaths, 500,000 cases of irreversible blindness and millions of cases of xerophthalmia annually.[19] Children and pregnant women are at highest risk. Vitamin A is supplemented orally and by injection in areas where the diet is deficient in vitamin A. As of 1999, there were 43 countries that had vitamin A supplementation programs for children under 5; in 10 of these countries, two high dose supplements are available per year, which, according to UNICEF, could effectively eliminate VAD.[20] However, UNICEF and a number of NGOs involved in supplementation note more frequent low-dose supplementation should be a goal where feasible.[21]

Because many children in countries where there is a dietary deficiency in vitamin A rely on rice as a staple food, the genetic modification to make rice produce the vitamin A precursor beta-carotene is seen as a simple and less expensive alternative to vitamin supplements or an increase in the consumption of green vegetables or animal products.

Initial analyses of the potential nutritional benefits of golden rice suggested consumption of golden rice would not eliminate the problems of vitamin A deficiency, but should be seen as a complement to other methods of vitamin A supplementation.[22][23] Since then, improved strains of golden rice have been developed containing sufficient provitamin A to provide the entire dietary requirement of this nutrient to people who eat about 75g of golden rice per day.[4]

In particular, since carotenes are hydrophobic, there needs to be a sufficient amount of fat present in the diet for golden rice (or most other vitamin A supplements) to be able to alleviate vitamin A deficiency. In that respect, it is significant that vitamin A deficiency is rarely an isolated phenomenon, but usually coupled to a general lack of a balanced diet (see also Vandana Shiva's arguments below). The RDA levels accepted in developed countries are far in excess of the amounts needed to prevent blindness.[4] Moreover, this claim referred to an early cultivar of golden rice; one bowl of the latest version provides 60% of RDA for healthy children.[24]

Research

The University of California and Rutgers University have conducted studies showing "...higher crop yields, reduced pesticide use and fewer pesticide-related health problems..." amongst Chinese farmers who used GM rice strains. This was published in the peer reviewed journal Science in 2005.[25]

Dr. José L. Domingo of the Laboratory of Toxicology and Environmental Health, School of Medicine, at Rovira i Virgili University in Spain said, "According to the information reported by the WHO, genetically modified products that are currently on the international market have all passed risk assessments conducted by national authorities." These assessments found no risk to human health. Dr. Domingo advocates continued research in the areas of GM rice and its effects on humans.[26]

Clinical trials / food safety and nutrition research

In 2009, research results of a clinical trial of Golden Rice with adult volunteers from the USA were published in the American Journal of Clinical Nutrition. It concluded that "beta carotene derived from Golden Rice is effectively converted to vitamin A in humans".[27] In a summary about the research the American Society for Nutrition suggests the implications of the research are that "Golden Rice could probably supply 50% of the Recommended Dietary Allowance (RDA) of vitamin A from a very modest amount — perhaps a cup — of rice, if consumed daily. This amount is well within the consumption habits of most young children and their mothers".[28]

In response to the research, a group of 20 scientists suggested in an open letter that there might be deficiencies in clinical trials: "There is now a large body of evidence that shows that GM crop/food production is highly prone to inadvertent and unpredictable pleiotropic effects, which can result in health damaging effects when GM food products are fed to animals. More specifically, our greatest concern is that this rice, which is engineered to overproduce beta carotene, has never been tested in animals, and there is an extensive medical literature showing that retinoids that can be derived from beta carotene are both toxic and cause birth defects." [29] However, it is well known that beta carotene is found and consumed in many nutritious foods eaten around the world, including fruits and vegetables. Beta carotene in food is a safe source of vitamin A.[30]

The Food Allergy Resource and Research Program of the University of Nebraska undertook research in 2006 that showed the proteins from the new genes in Golden Rice did not show any allergenic properties.[31]

In August 2012, Tufts University and others published new research on Golden Rice in the American Journal of Clinical Nutrition showing that the beta carotene produced by Golden Rice is as good as beta carotene in oil at providing vitamin A to children.[32] The study states that "recruitment processes and protocol were approved",[32] but questions have been raised about the use of Chinese children to test the effects of Golden Rice.[33]

Controversy

Critics of genetically engineered crops have raised various concerns. An early issue was that golden rice originally did not have sufficient vitamin A. This problem was solved by the development of new strains of rice.[4] The speed at which vitamin A degrades once the rice is harvested, and how much remains after cooking are contested.[34] However, a 2009 study concluded that golden rice is effectively converted into vitamin A in humans[13] and a 2012 study that fed 68 children ages 6 to 8 concluded that golden rice was as good as vitamin A supplements and better than the natural beta-carotene in spinach.[15]
Greenpeace opposes the use of any patented genetically modified organisms in agriculture and opposes the cultivation of golden rice, claiming it will open the door to more widespread use of GMOs.[35][36] However this is rejected by IRRI, claiming that "None of the companies listed ... are involved in carrying out the research and development activities of IRRI or its partners in Golden Rice, and none of them will receive any royalty or payment from the marketing or selling of Golden Rice varieties developed by IRRI."[37]

Vandana Shiva, an Indian anti-GMO activist, argued the problem was not the plant per se, but potential problems with poverty and loss of biodiversity. Shiva claimed these problems could be amplified by the corporate control of agriculture. By focusing on a narrow problem (vitamin A deficiency), Shiva argued, golden rice proponents were obscuring the limited availability of diverse and nutritionally adequate food.[38] Other groups argued that a varied diet containing foods rich in beta carotene such as sweet potato, leafy green vegetables and fruit would provide children with sufficient vitamin A.[39] However Keith West of Johns Hopkins Bloomberg School of Public Health countered that foodstuffs containing vitamin A are either unavailable, or only available at certain seasons, or that they are too expensive for poor families in underdeveloped countries.[15]

In 2008 WHO malnutrition expert Francesco Branca cited the lack of real-world studies and uncertainty about how many people will use golden rice, concluding "giving out supplements, fortifying existing foods with vitamin A, and teaching people to grow carrots or certain leafy vegetables are, for now, more promising ways to fight the problem".[40]

In 2013, author Michael Pollan, who had critiqued the product in 2001, unimpressed by the benefits, expressed support for the continuation of the research.[41]

Protests

On August 8, 2013 an experimental plot of golden rice being grown in the Philippines was uprooted by protesters.[24][41][42] Mark Lynas, a famous former anti-GMO activist, reported in Slate that the vandalism was carried out by a group of activists led by the extreme left-inclined Kilusang Magbubukid ng Pilipinas (KMP) (unofficial translation: Farmers' Movement of the Philippines), to the dismay of other protesters.[41][43] No local farmers participated in the uprooting, only the small number of activists damaged the Golden Rice crops, because the farmers believe in their local customs which imply that killing a living rice plant is unlucky.[44]

Distribution

Potrykus has enabled golden rice to be distributed free to subsistence farmers.[45] Free licenses for developing countries were granted quickly due to the positive publicity that golden rice received, particularly in Time magazine in July 2000. [46] Monsanto Company was one of the first companies to grant free licences.[47]

The cutoff between humanitarian and commercial use was set at US$10,000. Therefore, as long as a farmer or subsequent user of golden rice genetics does not make more than $10,000 per year, no royalties need to be paid. In addition, farmers are permitted to keep and replant seed.[48]

Friday, January 23, 2015

Paleoclimatology

From Wikipedia, the free encyclopedia
 
Paleoclimatology (in British spelling, palaeoclimatology) is the study of changes in climate taken on the scale of the entire history of Earth. It uses a variety of proxy methods from the Earth and life sciences to obtain data previously preserved within (e.g.) rocks, sediments, ice sheets, tree rings, corals, shells and microfossils; it then uses these records to determine the past states of the Earth's various climate regions and its atmospheric system. Studies of past changes in the environment and biodiversity often reflect on the current situation, and specifically the impact of climate on mass extinctions and biotic recovery.[1]

History

The scientific study field of paleoclimate begun to form in the early 19th century, when discoveries about glaciations and natural changes in Earth's climate past helped to identify the process of the greenhouse effect.

Reconstructing ancient climates

Palaeotemperature graphs compressed together

Paleoclimatologists employ a wide variety of techniques to deduce ancient climates.

Ice

Mountain glaciers and the polar ice caps/ice sheets provide much data in paleoclimatology. Ice-coring projects in the ice caps of Greenland and Antarctica have yielded data going back several hundred thousand years—over 800,000 years in the case of the EPICA project.
  • Air trapped within fallen snow becomes encased in tiny bubbles as the snow is compressed into ice in the glacier under the weight of later years' snow. This trapped air has proven a tremendously valuable source for direct measurement of the composition of air from the time the ice was formed.
  • Layering can be observed due to seasonal pauses in ice accumulation and can be used to establish chronology; associating specific depths of the core with ranges of time.
  • Changes in the layering thickness can be used to determine changes in precipitation or temperature.
  • Oxygen-18 quantity changes (δ18O) in ice layers represent changes in average ocean surface temperature. Water molecules containing the heavier O-18 evaporate at a higher temperature than water molecules containing the normal Oxygen-16 isotope. The ratio of O-18 to O-16 will be higher as temperature increases. It also depends on other factors such as the water's salinity and the volume of water locked up in ice sheets. Various cycles in those isotope ratios have been detected.
  • Pollen has been observed in the ice cores and can be used to understand which plants were present as the layer formed. Pollen is produced in abundance and its distribution is typically well understood. A pollen count for a specific layer can be produced by observing the total amount of pollen categorized by type (shape) in a controlled sample of that layer. Changes in plant frequency over time can be plotted through statistical analysis of pollen counts in the core. Knowing which plants were present leads to an understanding of precipitation and temperature, and types of fauna present. Palynology includes the study of pollen for these purposes.
  • Volcanic ash is contained in some layers, and can be used to establish the time of the layer's formation. Each volcanic event distributed ash with a unique set of properties (shape and color of particles, chemical signature). Establishing the ash's source will establish a range of time to associate with layer of ice.

Dendroclimatology

Climatic information can be obtained through an understanding of changes in tree growth. Generally, trees respond to changes in climatic variables by speeding up or slowing down growth, which in turn is generally reflected a greater or lesser thickness in growth rings. Different species, however, respond to changes in climatic variables in different ways. A tree-ring record is established by compiling information from many living trees in a specific area. Older intact wood that has escaped decay can extend the time covered by the record by matching the ring depth changes to contemporary specimens. Using this method some areas have tree-ring records dating back a few thousand years. Older wood not connected to a contemporary record can be dated generally with radiocarbon techniques. A tree-ring record can be used to produce information regarding precipitation, temperature, hydrology, and fire corresponding to a particular area.
On a longer time scale, geologists must refer to the sedimentary record for data.
Sedimentary content
  • Sediments, sometimes lithified to form rock, may contain remnants of preserved vegetation, animals, plankton or pollen, which may be characteristic of certain climatic zones.
  • Biomarker molecules such as the alkenones may yield information about their temperature of formation.
  • Chemical signatures, particularly Mg/Ca ratio of calcite in Foraminifera tests, can be used to reconstruct past temperature.
  • Isotopic ratios can provide further information. Specifically, the δ18O record responds to changes in temperature and ice volume, and the δ13C record reflects a range of factors, which are often difficult to disentangle.
Sea floor core sample labelled to identify the exact spot on the sea floor where the sample was taken. Slight variations in location can make a significant difference in the chemical and biological composition of the sediment sample.
On a longer time scale, the rock record may show signs of sea level rise and fall; further, features such as "fossilised" sand dunes can be identified. Scientists can get a grasp of long term climate by studying sedimentary rock going back billions of years. The division of earth history into separate periods is largely based on visible changes in sedimentary rock layers that demarcate major changes in conditions. Often these include major shifts in climate.

Sclerochronology

Corals
Coral "rings" are similar to tree rings, except they respond to different things, such as the water temperature, freshwater influx, pH changes, and wave action. From this source, certain equipment can be used to derive the sea surface temperature and water salinity from the past few centuries. The δ18O of coralline red algae provides a useful proxy of the combined sea surface temperature and sea surface salinity at high latitudes and the tropics, where many traditional techniques are limited.[2][3]

Limitations

A multinational consortium, the European Project for Ice Coring in Antarctica (EPICA), has drilled an ice core in Dome C on the East Antarctic ice sheet and retrieved an ice which dates to roughly 800,000 years ago.[4] The international ice core community has, under the auspices of International Partnerships in Ice Core Sciences (IPICS), defined a priority project to obtain the oldest possible ice core record from Antarctica, an ice core record reaching back to or towards 1.5 million years ago.[5] The deep marine record, the source of most isotopic data, only exists on oceanic plates, which are eventually subducted — the oldest remaining material is 200 million years old. Older sediments are also more prone to corruption by diagenesis. Resolution and confidence in the data decrease over time.

Notable climate events in Earth history

Knowledge of precise climatic events decreases as the record goes further back in time. Some notable climate events:

History of the atmosphere

Earliest atmosphere

The first atmosphere would have consisted of gases in the solar nebula, primarily hydrogen. In addition, there would probably have been simple hydrides such as those now found in gas giants like Jupiter and Saturn, notably water vapor, methane and ammonia. As the solar nebula dissipated, these gases would have escaped, partly driven off by the solar wind.[6]

Second atmosphere

The next atmosphere, consisting largely of nitrogen plus carbon dioxide and inert gases, was produced by outgassing from volcanism, supplemented by gases produced during the late heavy bombardment of Earth by huge asteroids.[6] A major part of carbon dioxide emissions were soon dissolved in water and built up carbonate sediments.

Water-related sediments have been found dating from as early as 3.8 billion years ago.[7] About 3.4 billion years ago, nitrogen was the major part of the then stable "second atmosphere". An influence of life has to be taken into account rather soon in the history of the atmosphere, because hints of early life forms are to be found as early as 3.5 billion years ago.[8] The fact that this is not perfectly in line with the 30% lower solar radiance (compared to today) of the early Sun has been described as the "faint young Sun paradox".

The geological record however shows a continually relatively warm surface during the complete early temperature record of Earth with the exception of one cold glacial phase about 2.4 billion years ago. In the late Archaean eon an oxygen-containing atmosphere began to develop, apparently from photosynthesizing cyanobacteria (see Great Oxygenation Event) which have been found as stromatolite fossils from 2.7 billion years ago. The early basic carbon isotopy (isotope ratio proportions) is very much in line with what is found today, suggesting that the fundamental features of the carbon cycle were established as early as 4 billion years ago.

Third atmosphere

The constant re-arrangement of continents by plate tectonics influences the long-term evolution of the atmosphere by transferring carbon dioxide to and from large continental carbonate stores. Free oxygen did not exist in the atmosphere until about 2.4 billion years ago during the Great Oxygenation Event and its appearance is indicated by the end of the banded iron formations. Before this time, any oxygen produced by photosynthesis was consumed by oxidation of reduced materials, notably iron.
Molecules of free oxygen did not start to accumulate in the atmosphere until the rate of production of oxygen began to exceed the availability of reducing materials. This point signifies a shift from a reducing atmosphere to an oxidizing atmosphere. O2 showed major variations until reaching a steady state of more than 15% by the end of the Precambrian.[9] The following time span was the Phanerozoic eon, during which oxygen-breathing metazoan life forms began to appear.

The amount of oxygen in the atmosphere has fluctuated over the last 600 million years, reaching a peak of about 30% around 280 million years ago, significantly higher than today's 21%. Two main processes govern changes in the atmosphere: Plants use carbon dioxide from the atmosphere, releasing oxygen. Breakdown of pyrite and volcanic eruptions release sulfur into the atmosphere, which oxidizes and hence reduces the amount of oxygen in the atmosphere. However, volcanic eruptions also release carbon dioxide, which plants can convert to oxygen. The exact cause of the variation of the amount of oxygen in the atmosphere is not known. Periods with much oxygen in the atmosphere are associated with rapid development of animals. Today's atmosphere contains 21% oxygen, which is high enough for this rapid development of animals.[10]

Currently, anthropogenic greenhouse gases are accumulating in the atmosphere, which is the main cause of global warming.[11]

Climate during geological ages

Timeline of glaciations, shown in blue

Precambrian climate

The climate of the late Precambrian showed some major glaciation events spreading over much of the earth. At this time the continents were bunched up in the Rodinia supercontinent. Massive deposits of tillites are found and anomalous isotopic signatures are found, which gave rise to the Snowball Earth hypothesis. As the Proterozoic Eon drew to a close, the Earth started to warm up. By the dawn of the Cambrian and the Phanerozoic, life forms were abundant in the Cambrian explosion with average global temperatures of about 22 °C.

Phanerozoic climate

500 million years of climate change

Major drivers for the preindustrial ages have been variations of the sun, volcanic ashes and exhalations, relative movements of the earth towards the sun and tectonically induced effects as for major sea currents, watersheds and ocean oscillations. In the early Phanerozoic, increased atmospheric carbon dioxide concentrations have been linked to driving or amplifying increased global temperatures.[12] Royer et al. 2004[13] found a climate sensitivity for the rest of the Phanerozoic which was calculated to be similar to today's modern range of values.

The difference in global mean temperatures between a fully glacial Earth and an ice free Earth is estimated at approximately 10 °C, though far larger changes would be observed at high latitudes and smaller ones at low latitudes[citation needed]. One requirement for the development of large scale ice sheets seems to be the arrangement of continental land masses at or near the poles. The constant rearrangement of continents by plate tectonics can also shape long-term climate evolution. However, the presence or absence of land masses at the poles is not sufficient to guarantee glaciations or exclude polar ice caps. Evidence exists of past warm periods in Earth's climate when polar land masses similar to Antarctica were home to deciduous forests rather than ice sheets.

The relatively warm local minimum between Jurassic and Cretaceous goes along with widespread tectonic activity, e.g. the breakup of supercontinents.

Superimposed on the long-term evolution between hot and cold climates have been many short-term fluctuations in climate similar to, and sometimes more severe than, the varying glacial and interglacial states of the present ice age. Some of the most severe fluctuations, such as the Paleocene-Eocene Thermal Maximum, may be related to rapid climate changes due to sudden collapses of natural methane clathrate reservoirs in the oceans.[citation needed]

A similar, single event of induced severe climate change after a meteorite impact has been proposed as reason for the Cretaceous–Paleogene extinction event. Other major thresholds are the Permian-Triassic, and Ordovician-Silurian extinction events with various reasons suggested.

Quaternary climate

Ice core data for the past 400,000 years. Note length of glacial cycles averages ~100,000 years. Blue curve is temperature, green curve is CO2, and red curve is windblown glacial dust (loess). Today's date is on the left side of the graph.

The Quaternary sub-era includes the current climate. There has been a cycle of ice ages for the past 2.2–2.1 million years (starting before the Quaternary in the late Neogene Period).

Note in the graphic on the right the strong 120,000-year periodicity of the cycles, and the striking asymmetry of the curves. This asymmetry is believed to result from complex interactions of feedback mechanisms. It has been observed that ice ages deepen by progressive steps, but the recovery to interglacial conditions occurs in one big step.

The graph below shows the temperature change over the past 12 000 years, from various sources. The thick black curve is an average.
Holocene Temperature Variations

Climate forcings

Radiative forcings, IPCC(2007)

The climate forcing is the difference of radiant energy (sunlight) received by the Earth and the outgoing longwave radiation back to space. The radiative forcing is quantified based on the CO2 amount in the tropopause, in units of watts per square meter to the Earth's surface.[14] Dependent on the radiative balance of incoming and outgoing energy, the Earth either warms up or cools down. Earth radiative balance originates from changes in solar insolation and the concentrations of greenhouse gases and aerosols. Climate change may be due to internal processes in Earth sphere's and/or following external forcings.[15]

Internal processes and forcings

The Earth's climate system involves the study of the atmosphere, biosphere, cryosphere, hydrosphere, and lithosphere,[16] and the sum of these processes from Earth sphere's is considered the processes affecting the climate. Greenhouse gases act as the internal forcing of the climate system. Particular interests in climate science and paleoclimatology focuses on the study of Earth climate sensitivity, in response to the sum of forcings.

Examples:

External forcings

  • The Milankovitch cycles determine Earth distance and position to the Sun. The solar insolation, is the total amount of solar radiation received by Earth.
  • Volcanic eruptions, are considered an external forcing.[17]
  • Human changes of the composition of the atmosphere or land use.[17]

Mechanisms

On timescales of millions of years, the uplift of mountain ranges and subsequently weathering processes of rocks and soils and the subduction of tectonic plates, are an important part of the carbon cycle.[18][19] The weathering sequesters CO2, by the reaction of minerals with chemicals (especially silicate weathering with CO2) and thereby removing CO2 from the atmosphere and reducing the radiative forcing. The opposite effect is volcanism, responsible for the natural greenhouse effect, by emitting CO2 into the atmosphere, thus affecting glaciation (Ice Age) cycles. James Hansen suggested that humans emit CO2 10,000 times faster than natural processes have done in the past.[20]

Ice sheet dynamics and continental positions (and linked vegetation changes) have been important factors in the long term evolution of the earth's climate.[21] There is also a close correlation between CO2 and temperature, where CO2 has a strong control over global temperatures in Earth history.[22]

Memory and trauma

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Memory_and_trauma ...