In May 2013, the levels of carbon dioxide in Earth's atmosphere reached the same levels last seen 3 million years ago during the Pliocene Epoch when humans had yet to appear on the planet. But what was once seen as an alarming threshold has now become business as usual, with this year's rise in atmospheric carbon dioxide expected to be 10 percent higher than normal — a rapid rate of change that is "deeply concerning" climate scientists. "We've done in a little more than 50 years what the Earth naturally took 10,000 years to do," one scientist said. | 
No comments:
Post a Comment