https://www.quora.com/What-hard-evidence-is-there-that-the-current-period-of-warming-is-caused-by-human-beings-How-can-we-possibly-separate-our-contribution-from-the-natural-process/
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The Historyscoper's Science and Technology Watch Blog Apr. 2, 2015
The Historyscoper's Science and Technology Watch Blog Apr. 2, 2015
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