It's been hotter; it's been colder.
Without any help from us.
Man and polar bear has managed to survive; the hard way.
Nothing on this planet remains constant, and who are we to say that it should?
Should we find alternatives to oil? Of course!
Should we care for this planet and all life on it? Of course!
But we should approach all our endeavors with a clear head and a steady hand. Be cool and calm in the face of fear mongers and doomsayers; be ever-skeptical of the all-knowing.