IPCC Rumblings
The Intergovernmental Panel on Climate Changes Working Group I has made available a draft of its third assessment on climate change to expert reviewers through the Internet. The address was leaked and although the IPCC has since removed the draft from its website, there was sufficient time for many of the experts skeptical of global warming theory to critique the report extensively.
Some of those criticisms can be found on a debate forum at www.vision.net.au/~daly. Chapter 1 of the draft report states, “The fact that global mean temperature has increased since the late nineteenth century and that other trends have been observed does not mean that we have identified an anthropogenic effect on the climate system.” The report also says in Chapter 5 that, “The net forcing of the climate over the last 100 years (and since pre-industrial times) may be close to zero or even negative.”
These are not the types of statements made by scientists who are convinced that man is definitely causing global warming. Of course, several statements in the draft of the Second Assessment were equally damning, but many were purged prior to publication, causing a major scandal. No wonder that the IPCC doesnt want the drafts to be open to the public.
One reviewer in New Zealand, Dr. Vincent Gray, pointed out that the new report has 40 different scenarios and all are treated as equally likely, that is, there is no longer any predicted range of warming. This makes it difficult to convince governments that there is a pressing need for drastic energy cuts. So, Tom Wigley, with the National Center for Atmospheric Research, has come up with an “indicative scenario” in a paper he wrote for the Pew Center on Climate Change that was based in part on the IPCC draft report. Wigleys paper was widely touted in the press last summer as definitive.
Dr. Gray also notes that the IPCC ignores the fact that CO2 emissions have been falling and overestimates other parameters such as world population, economic development, fuel usage, etc. They set their parameters in the computer models, for example, based on the “latest most accurate climate and physical quantity measurements.” Then they multiply each by a “precautionary principle factor, which is currently 250 percent.”
“For example,” commented Gray, “the measured rate of increase of carbon dioxide in the atmosphere for the past 35 years, is 0.4 percent a year. So the figure incorporated in the model is 250 percent times 0.4, [or] one percent a year.” According to Gray, the rate of methane emission rise in the atmosphere has been falling for the last 15 years. “But the modellist cannot tolerate this,” said Gray. “The trend must be instantly reversed. A similar adjustment awaits all the other parameters.” Other extensive reviews are also available at the website.
The Pitfalls of Forecasting
The recent major snowstorm along the East Coast caught weather forecasters by complete surprise. They had predicted 2 to 4 inches of snowfall; 8 to 12 inches fell instead. Roger Pielke, of the National Center for Atmospheric Research, and Daniel Sarewitz, of Columbia Universitys Center for Science, Policy, and Outcomes, argue that such misses are not uncommon and indeed are to be expected. “The idea that fast computers and sophisticated science can give us perfect weather predictions is nonsense,” the authors wrote. “Weather systems are complex phenomena whose behavior can only be approximated, even by the most advanced technologies.”
Problems with forecasting carry over into the realm of climate science, say the authors. “Predictions of global warming have focused international environmental efforts on reducing greenhouse gas emissions. But future economic trends, geopolitical events, and technological advances three variables that defy predictive accuracy will have a much greater impact on emissions than any conceivable international agreements.”
They also warn that, “Predictions of the future can be more dangerous than ignorance, if they induce us to behave in ways that reduce our resilience in the face of inevitable uncertainties and contingencies” (Washington Times, February 2, 2000).
Malaria During the Little Ice Age
Green activists continue to claim that global warming will shift diseases such as malaria from the tropics to the temperate zones. These predictions are wrong, according to Paul Reiter, with the Centers for Disease Control and Prevention. In an article appearing in Emerging Infectious Diseases (March-April 2000) he writes, “Until the second half of the 20th century, malaria was endemic and widespread in many temperate regions, with major epidemics as far north as the Arctic Circle.” He further notes that, “From 1564 to the 1730s the coldest period of the Little Ice Age malaria was an important cause of illness and death in several parts of England.” The article can be found at www.cdc.gov/ncidod/eid/vol6no1/reiter.htm.
Megadroughts Common to Africa
With increased study of evidence from the distant past, scientists are becoming increasingly aware that climate change, indeed catastrophic climate change, is the norm. The New York Times (February 8, 2000) reports that recent research has found that East Africa experienced “decades-long droughts far longer and more severe than any in recorded weather history [that] alternated with periods when rainfall was heavier than today.” The article also notes that, “The droughts dwarfed any experienced by humans in the 20th century, including the American Dust Bowl of the 1930s and the African Sahel drought of the 1970s.”
According to Dr. Dirk Verschuren, who headed the research that appeared in the January 27 issue of Nature, “We have to anticipate that a major catastrophic drought will happen sooner or later, and we must prepare for such an event.” The New York Times reports a “broader lesson” noted by Verschuren: “That irrespective of any human impact on the worlds climate, there is great natural variability in rainfall, and this variability may swamp the effects of any global warming produced by industrial emissions of heat-trapping greenhouse gases like carbon dioxide.”
Etc.
- The February 6 Baltimore Sun reported on a 300 percent increase in the population of Adelie penguins around Cape Royds, Antarctica over the past two decades. Biologist David Ainley “blames” global warming, arguing that reduced ice cover has now placed these penguins closer to their oceanic food sources, thus boosting survival rates.
Before global warming advocates add penguin overpopulation to their list of woes, they may want to sit down with their ozone depletion counterparts and try to get their stories straight. As you recall, these are the very same Adelie penguins many claimed are threatened by the Antarctic ozone hole. Increased solar radiation through the ozone hole was supposed to decimate phytoplankton populations, which form the base of the food chain upon which the penguins and other Antarctic animals rely.
- Green activists and press and politicians with views sympathetic to the Green agenda take every opportunity to highlight temperature events that can be linked to warmer temperatures. They never seem to take notice, however, when the weather turns cold and nasty. In the interest of balance, we would like to review the other side of the climate ledger.
- Australias National Climate Center reported that it has just experienced its coldest summer in 50 years. It blames the cold snap on La Nia, but as pointed out at www.vision.net.au/~daly/, “this is neither the longest nor the biggest such La Nia in recent decades.”
- The opening of the Alaska snow crab fishery is being delayed by an unusual buildup of ice in the Bering Sea. According to the Alaska Department of Fish and Game, the scheduled opening of January 15 may be postponed until late April or May if the ice pushes much further south. These are the worst ice conditions in the area since 1975.
- The “city of eternal spring” Kunming in China just had its worst snowfall in 17 years and Beijing just finished its coldest January in 23 years.
- Moving further west, Israel experienced its heaviest snowfall in 50 years. The country came to a complete standstill, though children enjoyed snowball fights and building snowmen.
- Still further west, snowfalls for much of the U.S. have been the heaviest in 25 years.
Of course we know that these events do not disprove the theory of manmade global warming, nor do they portend a coming ice age, but neither do the events that Green activists cite “prove” that manmade global warming is real.