How much have average global temperatures risen over the 20th century?: Global Warming Basics

How much have average global temperatures risen over the 20th century?: Global Warming Basics

How much have average global temperatures risen over the 20th century?: Global Warming Basics

How much have average global temperatures risen over the 20th century?: Michael Oppenheimer (Professor, Princeton University)

User: Scribble

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Uploaded: 2015-04-15

Duration: 00:41

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