File photo of Texas State Park Police Officer Thomas Bigham walking 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. Researchers calculated that global warming has made such a Texas heat wave about 20 times more likely to happen during a La Nina year. La Nina is increasingly expected to emerge in the coming months for the first time in four years.
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