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Online Book:
Read Abrupt Climate Change: Inevitable Surprises (2001) online.

Source: Common Dreams

Published on Wednesday, December 12, 2001
A Warning on Climate Change
Pollution's Effects Could Be Sudden, NAS Report Says

by Eric Pianin

While recent climate change studies have focused on the risks of a gradual rise in the Earth's temperature, a new National Academy of Sciences report has concluded that greenhouse gases and other pollutants could trigger large, abrupt and potentially disastrous climate changes.

Citing a wealth of paleontological evidence, historical observations and computer modeling analyses reaching back hundreds of centuries, researchers found evidence that, in some places, periods of gradual changes were punctuated by sudden temperature spikes of about 10 degrees Celsius in only a decade.

Roughly half of the warming that has occurred in the northern part of the Atlantic Ocean since the last ice age was achieved in only a decade, the report said. That warming was accompanied by significant climate changes across the globe, including flooding and drought, it said. Since then, less dramatic climate changes have occurred, affecting precipitation, hurricanes and the El Ni�o events that have disrupted temperatures in the tropical Pacific.

"Abrupt climate changes were especially common when the climate system was being forced to change most rapidly," the study states. "Thus, greenhouse warming and other human alterations of the earth system may increase the possibility of large, abrupt, and unwelcome regional or global climatic events."


The authors of the study, including panel chairman Richard Alley of Pennsylvania State University, hastened to add that "there is no need for undue alarm" and that societies have demonstrated they are good at adapting to serious climate change.

But the report offers a new wrinkle to the decades-long debate over global warming problems, and it likely will provide additional ammunition to European and Asian environmental leaders seeking to persuade the Bush administration to reconsider its opposition to a global warming treaty recently concluded in North Africa.

Jerry Taylor, director of natural resource studies for the libertarian Cato Institute, played down the report's significance. "It is not enough for a report to come out speculating about unknowables," he said. "It looks like warming is occurring and it is industrially induced. But it's been far less dramatic than the computer models say should have occurred by now."

Studies on human-induced global warming by the U.N.-sanctioned Intergovernmental Panel on Climate Change project that within the next hundred years the Earth's average surface temperature will increase by 1.4 to 5.8 degrees Celsius. The wide range of uncertainty in those estimates reflects both the different assumptions about future concentrations of greenhouse gases and aerosols in the various scenarios considered by the U.N. panel and the differing climate sensitivities of the various climate models used in the simulations.

Last June, another National Academy of Sciences panel of top U.S. scientists commissioned by the White House declared that global warming was a real problem and was getting worse. The panel said human activity was largely responsible but that natural factors could not be ruled out.

� 2001 The Washington Post Company

Online Book:
Read Abrupt Climate Change: Inevitable Surprises (2001) online.

<-- Return To Surviving Climate Change

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