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<p>FILE - 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)</p>

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Global warming tied to risk of weather extremes
July 11, 2012 9:15 p.m.

Global warming tied to risk of weather extremes

NEW YORK - Last year 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?