How today’s global warming is unlike the last 2,000 years of climate shifts

According to those folks, it’s hotter now than at any time during the last 2000 years. They must have had very cold-resistant birches and other trees 800 years ago in Greenland. We know that Greenland was extensively wooded and that those tres don’t grow there today as its too cold. How did that happen? We know that in the 3rd century roman perfects reported taxes paid in kind in Northern England as red wine. This means that those grapes grew there 1700 years ago. Today they don’t. How that? We don’t have temperature measurements from those times. But we see what has happened and that does not agree with the models. Whats to be believed – observations or computer models?

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