Forecast puts Earth’s future under a cloud

More than half of the world’s major forests will be lost if global temperatures rise by an average of 3C or more by the end of the century, it was claimed yesterday. The prediction comes from the most comprehensive analysis yet of the potential effects of human-made global warming.

A 3C warming could also present a yet more dangerous scenario where the temperatures induce plants to become net producers of carbon dioxide. “As temperatures go up, plants like it better and they start to grow more vigorously and start to take up more carbon dioxide from the air,” Dr O’Neill said. “But there comes a point where the take-up is saturated for a given vegetation cover, then the ecosystem starts to respire more than it’s taking up.”
The Guardian