From David Strumfels:
Some notes before reading this article. Looking into the future is always hazardous, whatever your prediction. Furthermore, facts are usually messy, and sometimes can be used in opposition to a theory as well as support. A good example is the very basis of anthropogenic global warming: the cyclic but overall warming of 1850-1900 to ~2005 correlates well with the anthropogenic CO2 rise from 280 ppm to almost 400 ppm, which shows no sign of abating (yet, because I believe it will). But is it cause and effect or mere correlation? Or some of both? That CO2 is a greenhouse gas weighs, I believe, towards cause and effect. But careful study of the data seems to me to show that much of the warming until 1970-1980 was more natural, a combination of effects Earth's climate has always lived with. Only after the mid-late '70s does another effect exert more serious influence, and the only one I can think of is CO2.
My study of global temperature graphs also made a detail about it clear (although I'm not the first to notice it): as I've just alluded, the warming is not straight-line, even with random variation making it messy. Look at the cart below:
The lines make the cyclic nature of warming stand out, although by themselves, they do not prove it. Have we studied earlier historic records to see if they stand up? Honestly, I don't know -- but it's an important analysis if we can do it. But historical records are based largely on temperature proxies (ice cores, tree rings, etc., which are notoriously prone to scatter) and it may be impossible.
These cycles (they are, of course, not the straight lines as I illustrate them) have met with dismissal by most warming alarmists as statistical massaging, and they may prove to be right about that. May be proved -- or may not. As detailed, strongly agreeable temperature proxies don't exist for history or "deep time", such short cycles would never be found whether they are there or not. My point here is that when it comes to climate predictions, I don't see where we even could have sufficient knowledge or understanding to make solid predictions, like a 95% the temperature will be 4-8 degrees higher than today (if nothing changes is sometimes added, as if nothing will change).
I might have been dismissive of this hypothesis too, if temperatures had kept climbing as they had done since the '70s. But they didn't. Starting around the 1997-2005 range (exact numbers vary, but I lean toward the latter), the warming clearly stopped, leaving us in at least a holding pattern, or even with some mild cooling (a disputable claim). It may be just a little blip, of course. But it strongly fits in to the cyclic warming hypothesis, is almost exactly what we would have predicted if that hypothesis is true. If it is true, expect up to thirty years of cooling before warming (if nothing changes, remember) resumes. Since much will change, and has already been changing for ~20+ years -- developments in recyclable energy, replacement of natural gas over high carbon fossil fuels, the on-going efficiency improvements in cars, appliances, CO2 reclamation, etc. -- the CO2 trend must flatten out and perhaps even decline, perhaps starting as soon as twenty years from now although as always with making predictions I will not bet my fortune on it. But by 2050 and later, I would make that bet (though I'll be 94 years old by then and won't have enough money if I lose).
I'll say no more and let Ferrara speak for himself.
Around 1250 A.D., historical records show, ice packs began showing up farther south in the North Atlantic. Glaciers also began expanding on Greenland, soon to threaten Norse settlements on the island. From 1275 to 1300 A.D., glaciers began expanding more broadly, according to radiocarbon dating of plants killed by the glacier growth. The period known today as the Little Ice Age was just starting to poke through.
Summers began cooling in Northern Europe after 1300 A.D., negatively impacting growing seasons, as reflected in the Great Famine of 1315 to 1317. Expanding glaciers and ice cover spreading across Greenland began driving the Norse settlers out. The last, surviving, written records of the Norse Greenland settlements, which had persisted for centuries, concern a marriage in 1408 A.D. in the church of Hvalsey, today the best preserved Norse ruin.
Colder winters began regularly freezing rivers and canals in Great Britain, the Netherlands and Northern France, with both the Thames in London and the Seine in Paris frozen solid annually. The first River Thames Frost Fair was held in 1607. In 1607-1608, early European settlers in North America reported ice persisting on Lake Superior until June. In January, 1658, a Swedish army marched across the ice to invade Copenhagen. By the end of the 17th century, famines had spread from northern France, across Norway and Sweden, to Finland and Estonia.
Reflecting its global scope, evidence of the Little Ice Age appears in the Southern Hemisphere as well. Sediment cores from Lake Malawi in southern Africa show colder weather from 1570 to 1820. A 3,000 year temperature reconstruction based on varying rates of stalagmite growth in a cave in South Africa also indicates a colder period from 1500 to 1800. A 1997 study comparing West Antarctic ice cores with the results of the Greenland Ice Sheet Project Two (GISP2) indicate a global Little Ice Age affecting the two ice sheets in tandem.
The Siple Dome, an ice dome roughly 100 km long and 100 km wide, about 100 km east of the Siple Coast of Antartica, also reflects effects of the Little Ice Age synchronously with the GISP2 record, as do sediment cores from the Bransfield Basin of the Antarctic Peninsula. Oxygen/isotope analysis from the Pacific Islands indicates a 1.5 degree Celsius temperature decline between 1270 and 1475 A.D.
The Franz Josef glacier on the west side of the Southern Alps of New Zealand advanced sharply during the period of the Little Ice Age, actually invading a rain forest at its maximum extent in the early 1700s. The Mueller glacier on the east side of New Zealand’s Southern Alps expanded to its maximum extent at roughly the same time.
Ice cores from the Andeas mountains in South America show a colder period from 1600 to 1800. Tree ring data from Patagonia in South America show cold periods from 1270 to 1380 and from 1520 to 1670. Spanish explorers noted the expansion of the San Rafael Glacier in Chile from 1675 to 1766, which continued into the 19th century.
The height of the Little Ice Age is generally dated as 1650 to 1850 A.D. The American Revolutionary Army under General George Washington shivered at Valley Forge in the winter of 1777-78, and New York harbor was frozen in the winter of 1780. Historic snowstorms struck Lisbon, Portugal in 1665, 1744 and 1886. Glaciers in Glacier National Park in Montana advanced until the late 18th or early 19th centuries. The last River Thames Frost Fair was held in 1814. The Little Ice Age phased out during the middle to late 19th century.
The Little Ice Age, following the historically warm temperatures of the Medieval Warm Period, which lasted from about AD 950 to 1250, has been attributed to natural cycles in solar activity, particularly sunspots. A period of sharply lower sunspot activity known as the Wolf Minimum began in 1280 and persisted for 70 years until 1350. That was followed by a period of even lower sunspot activity that lasted 90 years from 1460 to 1550 known as the Sporer Minimum. During the period 1645 to 1715, the low point of the Little Ice Age, the number of sunspots declined to zero for the entire time. This is known as the Maunder Minimum, named after English astronomer Walter Maunder. That was followed by the Dalton Minimum from 1790 to 1830, another period of well below normal sunspot activity.
The increase in global temperatures since the late 19th century just reflects the end of the Little Ice Age. The global temperature trends since then have followed not rising CO2 trends but the ocean temperature cycles of the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO). Every 20 to 30 years, the much colder water near the bottom of the oceans cycles up to the top, where it has a slight cooling effect on global temperatures until the sun warms that water. That warmed water then contributes to slightly warmer global temperatures, until the next churning cycle.
Those ocean temperature cycles, and the continued recovery from the Little Ice Age, are primarily why global temperatures rose from 1915 until 1945, when CO2 emissions were much lower than in recent years. The change to a cold ocean temperature cycle, primarily the PDO, is the main reason that global temperatures declined from 1945 until the late 1970s, despite the soaring CO2 emissions during that time from the postwar industrialization spreading across the globe.
The 20 to 30 year ocean temperature cycles turned back to warm from the late 1970s until the late 1990s, which is the primary reason that global temperatures warmed during this period. But that warming ended 15 years ago, and global temperatures have stopped increasing since then, if not actually cooled, even though global CO2 emissions have soared over this period. As The Economist magazine reported in March, “The world added roughly 100 billion tonnes of carbon to the atmosphere between 2000 and 2010. That is about a quarter of all the CO2 put there by humanity since 1750.” Yet, still no warming during that time. That is because the CO2 greenhouse effect is weak and marginal compared to natural causes of global temperature changes.
At first the current stall out of global warming was due to the ocean cycles turning back to cold. But something much more ominous has developed over this period. Sunspots run in 11 year short term cycles, with longer cyclical trends of 90 and even 200 years. The number of sunspots declined substantially in the last 11 year cycle, after flattening out over the previous 20 years. But in the current cycle, sunspot activity has collapsed. NASA’s Science News report for January 8, 2013 states,
“Indeed, the sun could be on the threshold of a mini-Maunder event right now. Ongoing Solar Cycle 24 [the current short term 11 year cycle] is the weakest in more than 50 years. Moreover, there is (controversial) evidence of a long-term weakening trend in the magnetic field strength of sunspots. Matt Penn and William Livingston of the National Solar Observatory predict that by the time Solar Cycle 25 arrives, magnetic fields on the sun will be so weak that few if any sunspots will be formed. Independent lines of research involving helioseismology and surface polar fields tend to support their conclusion.”
That is even more significant because NASA’s climate science has been controlled for years by global warming hysteric James Hansen, who recently announced his retirement.
But this same concern is increasingly being echoed worldwide. The Voice of Russia reported on April 22, 2013,
“Global warming which has been the subject of so many discussions in recent years, may give way to global cooling. According to scientists from the Pulkovo Observatory in St.Petersburg, solar activity is waning, so the average yearly temperature will begin to decline as well. Scientists from Britain and the US chime in saying that forecasts for global cooling are far from groundless.”
That report quoted Yuri Nagovitsyn of the Pulkovo Observatory saying, “Evidently, solar activity is on the decrease. The 11-year cycle doesn’t bring about considerable climate change – only 1-2%. The impact of the 200-year cycle is greater – up to 50%. In this respect, we could be in for a cooling period that lasts 200-250 years.” In other words, another Little Ice Age.
Faith in Global Warming is collapsing in formerly staunch Europe following increasingly severe winters which have now started continuing into spring. Christopher Booker explained in The Sunday Telegraph on April 27, 2013,
“Here in Britain, where we had our fifth freezing winter in a row, the Central England Temperature record – according to an expert analysis on the US science blog Watts Up With That – shows that in this century, average winter temperatures have dropped by 1.45C, more than twice as much as their rise between 1850 and 1999, and twice as much as the entire net rise in global temperatures recorded in the 20th century.”
A news report from India (The Hindu April 22, 2013) stated, “March in Russia saw the harshest frosts in 50 years, with temperatures dropping to –25° Celsius in central parts of the country and –45° in the north. It was the coldest spring month in Moscow in half a century….Weathermen say spring is a full month behind schedule in Russia.” The news report summarized,
“Russia is famous for its biting frosts but this year, abnormally icy weather also hit much of Europe, the United States, China and India. Record snowfalls brought Kiev, capital of Ukraine, to a standstill for several days in late March, closed roads across many parts of Britain, buried thousands of sheep beneath six-metre deep snowdrifts in Northern Ireland, and left more than 1,000,000 homes without electricity in Poland. British authorities said March was the second coldest in its records dating back to 1910. China experienced the severest winter weather in 30 years and New Delhi in January recorded the lowest temperature in 44 years.”
Booker adds, “Last week it was reported that 3,318 places in the USA had recorded their lowest temperatures for this time of year since records began. Similar record cold was experienced by places in every province of Canada. So cold has the Russian winter been that Moscow had its deepest snowfall in 134 years of observations.”
Britain’s Met Office, an international cheerleading headquarters for global warming hysteria, did concede last December that there would be no further warming at least through 2017, which would make 20 years with no global warming. That reflects grudging recognition of the newly developing trends. But that reflects as well growing divergence between the reality of real world temperatures and the projections of the climate models at the foundation of the global warming alarmism of the UN’s Intergovernmental Panel on Climate Change (IPCC). Since those models have never been validated, they are not science at this point, but just made up fantasies. That is why, “In the 12 years to 2011, 11 out of 12 [global temperature]forecasts [of the Met Office] were too high — and… none were colder than [resulted],” as BBC climate correspondent Paul Hudson wrote in January.
Global warming was never going to be the problem that the Lysenkoists who have brought down western science made it out to be. Human emissions of CO2 are only 4 to 5% of total global emissions, counting natural causes. Much was made of the total atmospheric concentration of CO2 exceeding 400 parts per million. But if you asked the daffy NBC correspondent who hysterically reported on that what portion of the atmosphere 400 parts per million is, she transparently wouldn’t be able to tell you. One percent of the atmosphere would be 10,000 parts per million. The atmospheric concentrations of CO2 deep in the geologic past were much, much greater than today, yet life survived, and we have no record of any of the catastrophes the hysterics have claimed. Maybe that is because the temperature impact of increased concentrations of CO2 declines logarithmically. That means there is a natural limit to how much increased CO2 can effectively warm the planet, which would be well before any of the supposed climate catastrophes the warming hysterics have tried to use to shut down capitalist prosperity.
