Agence France Presse: Global warming has plunged the planet into a crisis and the fossil fuel industries are trying to hide the extent of the problem from the public, Nasa’s top climate scientist said. "We’ve already reached the dangerous level of carbon dioxide in the atmosphere," James Hansen, 67, director of Nasa’s Goddard Institute for Space Studies in New York, said. "But there are ways to solve the problem" of heat-trapping greenhouse gases like carbon dioxide, which …