re: Scott Pruitt says carbon dioxide is not a primary contributor to global warming

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A few inconvenient questions that man-made climate change advocates can't answer.
Back in the old Medieval days wine grapes grew very well in England. Since it's too cold to grow them today, the logical conclusion is that it was warmer then.
1) What were the Romans, Gaules, Angles, Norse, etc doing to pump all that CO2 into the atmosphere?
Then it suddenly got colder, a lot colder! So cold in fact that smart scientist often refer to this period as the Little Ice Age.
2) What did humans do to cause this?! Did we stop exhaling CO2?
3) Why do these scientists never just propose what ever we did then, we do now?

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