4 could easily be true also. If I am a Polar Bear hunter but I can't travel so far in search of my quarry because the ice is melting and can't support the weigh

4 could easily be true also. If I am a Polar Bear hunter but I can't travel so far in search of my quarry because the ice is melting and can't support the weight of my snowmobile then bear numbers could indeed rise. Whether they continue to rise as temperatures increase is anyone's guess. In the end it matters little if the planet is warming from natural or man-made causes. If the environment is sufficiently degraded that things start to come apart then everything is in trouble.