The trees were kidding: world was warmer just a few centuries ago

The IPCC used it in its third assessment report. Al Gore used it in his movie. In fact, no graphic has had such a huge effect as the infamous hockeystick produced by Michael Mann, who used tree ring data to allegedly show that the last century’s warming was unprecedented, and the globe had never in 2000 years been this hot:

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UN chief snows us on Antarctica

In fact, while we’re told to panic about rising carbon dioxide levels, the globe still refuses to warm above the maximum temperature recorded in 1998. Indeed, South America has become very chile chilly, as Alexandre Aguiar of Brazil’s MetSul Weather Center complains:

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