How does Revkin try to refute some of the "uncertainties" about climate science throughout the article?

How does Revkin try to refute some of the “uncertainties” about climate science throughout the article?http://dotearth.blogs.nytimes.com/2014/09/26/certainties-uncertainties-and-choices-with-global-warming/ Read the essay, and answer this question: How does Revkin try to refute some of the “uncertainties” about climate science throughout the article? List all the specific points. half single spaced page.

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