If the earths systems were so unstable that a very very small amount of carbon released by humans could disrupt them, then they could not have lasted billions of years. --[[User:HHB|HHB]] 13:44, 4 May 2012 (EDT) | If the earths systems were so unstable that a very very small amount of carbon released by humans could disrupt them, then they could not have lasted billions of years. --[[User:HHB|HHB]] 13:44, 4 May 2012 (EDT) |