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I don't think the science is clear of what percentage is man-made and what percentage is natural. It's convoluted, for the people to say the science is decided on this is really arrogant, to be honest with you.

"Jeb Bush rails against 'intellectual arrogance' in climate change debate" by Ashley Killough, edition.cnn.com. May 21, 2015.
I don't think the science is clear of what percentage is man-made and what percentage is natural. It's convoluted, for the people to say the science is decided on this is really arrogant, to be honest with you.