Study links California drought to global warming

While researchers have sometimes connected weather extremes to man-made global warming, usually it's not done in real time. Now a study is asserting a link between climate change and both the intensifying California drought and the polar vortex blamed for a harsh winter that mercifully has just ended in many places.

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Outside scientists, such as Katharine Hayhoe at Texas Tech University, are calling this study promising but not quite proven as it pushes the boundaries in "one of the hottest topics in climate science today."

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