Obama: Action on Climate Change 'Economic, Security Imperative'

U.S. President Barack Obama says climate change is "an economic and a security imperative that we have to tackle now.” Obama spoke to reporters on the sidelines of the U.N. Climate Summit outside Paris, where leaders are working to agree on binding measures to keep global temperatures from rising more than two degrees C. above pre-Industrial Revolution levels.  The U.N. weather agency says the average global temperature will have risen by one degree by the end of 2015,...

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