The unusually hot spells and extreme drought that North America and other parts of the world have experienced over the last few years are inextricably linked to global warming, a prominent NASA scientist claims in new study.
Prof. James Hansen is a scientist at NASA's Goddard Institute for Space Studies in New York and a professor at Columbia University. His paper, Perception of Climate Change, will be published next week in the Proceedings of the National Academy of Science.
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