Arctic ice 'disappearing fast' BBC article
This is a great article explaining some of the complexities of what might happen if the ice melts. It doesn't just mean there is no ice for the polar bears, other factors come into play. They didn't even mention what might happen if the ice melts in regards to the Gulf stream.
I know some people say 'it's all conjecture, nobody can say what's gonna happen'. But if we get to a time where we have PROOF of global warming as opposed natural variations in world temps...if we reach that time without doing anything...we're screwed. You, me, parents, kids, that cute little puppy, all screwed.