Indo-Asian News Service: Carbon levels have reached a point of no return and may trigger disastrous climate change — unless they are reversed, scientists have warned. Their study is a departure from recent estimates that truly dangerous levels would be reached only later in this century. ‘There is a bright side to this conclusion,’ says James E. Hansen, the study`s co-author and director of the Goddard Institute for Space Studies, part of Columbia University`s Earth Institute. ‘By following a path …