By the middle of the 20th century, it was becoming clear that human action had significantly increased the production of these gases, and the process of “global warming” was accelerating. Today, nearly all scientists agree that we must stop and reverse this process now — or face a devastating cascade of natural disasters that will change life on earth as we know it.
For more information visit: http://www.un.org/en/globalissues/climatechange/index.shtml
