“Our data from the early Pliocene, when carbon dioxide levels remained close to modern levels for thousands of years, may indicate how warm the planet will eventually become if carbon dioxide levels are stabilized at the current value of 400 parts per million,” said Aradhna Tripati, a UCLA assistant professor in the department of Earth and space sciences and the department of atmospheric and oceanic sciences.The key word in that sentence is “eventually.” Admittedly, the Pliocene is not that far back and so it is clear that the climate can change somewhat quickly. It also seems clear that the earth is going to do what the earth is going to do and there is not much we can do to change it. The temperature got that high during the Pliocene without any humans around to help it do so. It is not immediately clear that humans are going to make a whole heck of a lot of difference this time.
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