Does the Southwest face a mega-drought?

New York Times: Rising global temperatures resulting from emissions of human origin could tip the southwestern United States into a period of prolonged extreme drought seen before only in distant geological history, a new study suggests. Researchers dug deep into the region`s climate history by studying a 270-foot core of lake sediment taken from the Valles Caldera, a volcanic depression in northern New Mexico. Data extracted from the core revealed "mega-droughts" in the region lasting as long as a thousand years.......

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