I believe we've already reached the point of no return. As parts of the North Pole melt that have never melted before, massive deposits of methane gas will be released. So massive that they will affect our climate, and we don't know exactly what will happen. It may be catastrophic. But ... I guess we'll find out. Obviously we should at least try to turn things around since our lives might depend on it.
'Trust-gap' between young and old is widening, survey shows