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  4. Michio Kaku
  5. Global warming is controversial, of course, but the...

Global warming is controversial, of course, but the controversy is mainly over whether human activity is driving it.

Michio Kaku
Driving, Global Warming, Controversial
"Monster snowstorms still spell global warming" by Michio Kaku, www.cnn.com. January 28, 2011.
Global warming is controversial, of course, but the controversy is mainly over whether human activity is driving it.