The first report to assess observed and projected changes in weather and climate extremes for the U.S. was released Thursday by the government's Climate Change Science Program.
According to the report, significant changes in extreme weather events have been observed throughout the U.S., including unusually hot days and nights, fewer unusually cold days and nights, fewer frost days and more frequent and intense heavy downpours.
"The costs of unmitigated climate change -- whether counted in dollars or human well-being -- are too great to ignore. We must start addressing this problem with the seriousness and urgency it warrants and move swiftly to reduce emissions and develop and implement preparedness measures," said Richard Moss, vice president for climate change at World Wildlife Fund in D.C.
In response to severe flooding in the Midwest, President Bush is asking Congress for $1.8 billion in emergency aid -- roughly the entire annual federal budget for climate change research programs.
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Read the final report: Weather and Climate Extremes in a Changing Climate