Rising Seas, Severe Drought, Could Come in Decades, Says U.S. Report

The United States could suffer the effects of abrupt climate changes within decades–sooner than some previously thought–says a new government report. It contends that seas could rise rapidly if melting of polar ice continues to outrun recent projections, and that an ongoing drought in the U.S. west could be the start of permanent drying for the region. Commissioned by the U.S. Climate Change Science Program, the report was authored by experts from the U.S. Geological Survey, Columbia University’s Lamont-Doherty Earth Observatory and other leading institutions. It was released at this week’s meeting of the American Geophysical Union.
Many scientists are now raising the possibility that abrupt, catastrophic switches in natural systems may punctuate the steady rise in global temperatures now underway. However, the likelihood and timing of such “tipping points,” where large systems move into radically new states, has been controversial. The new report synthesizes the latest published evidence on four specific threats for the 21st century. It uses studies not available to the Intergovernmental Panel on Climate Change (IPCC), whose widely cited 2007 report explored similar questions. “This is the most up to date, as it includes research that came out after IPCC assembled its data,” said Edward Cook, a climatologist at Lamont-Doherty and a lead author of the new study.

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