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Who doesn't think climate change is happening? Even the hardest skeptic acknowledges natural longer term climate change. Others acknowledge recent history as shown in these graphs but doubt the causation. Causation is very difficult to prove without a controlled experiment, so that's a reasonable doubt. Others accept the causation but doubt the predicted future changes, which absolutely are not settled, so they're right to doubt. Others accept predictions but doubt the cost to society will be great enough to warrant some expensive measures proposed to reduce it. That's absolutely not settled either.



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