Global warming

Associated Press
In this Wednesday, Aug. 3, 2011 file photo, Texas State Park police officer Thomas Bigham walks across the cracked lake bed of O.C. Fisher Lake in San Angelo, Texas. A combination of the long periods of 100-plus degree days and the lack of rain in the drought-stricken region has dried up the lake that once spanned over 5400 acres. The year 2011 brought a record heat wave to Texas, massive floods in Bangkok and an unusually warm November in England. How much has global warming boosted the chances of events like that? Quite a lot in Texas and England, but apparently not at all in Bangkok, according to new analyses released Tuesday, July 10, 2012. Researchers calculated that global warming has made such a Texas heat wave about 20 times more likely to happen during a La Nina year. (AP Photo/Tony Gutierrez)

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Global warming is leading to such severe storms, droughts and heat waves that nations should prepare for an unprecedented onslaught of deadly and costly weather disasters, an international panel of climate scientists said in a report issued earlier this year.

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