Are human causing climate change?

Name: Are human causing climate change?
Uploaded: 2013-09-27T19:27:22+00:00
Description: CNNi talks to climate scientist Michael Mann about an IPCC report that finds human are causing global warming.

Collected by CNN on Sep 27, 2013

CNNi talks to climate scientist Michael Mann about an IPCC report that finds human are causing global warming.

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