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We don't know what those other cycles were caused by in the past. Could be dinosaur flatulence, you know, or who knows?

"Rep. Rohrabacher: Global Warming May Have Been Caused By ‘Dinosaur Flatulence’". thinkprogress.org. February 10, 2007.
We don't know what those other cycles were caused by in the past. Could be dinosaur flatulence, you know, or who knows?