To be fair: Earth’s ice cover does change( always has), and it would have an impact on life on the planet. (always has)
The crux of the argument is wether or not man is responsible, or that big giant fusion ball in the sky, and our orbit around it. ( not to mention a whole host of other variables that have nothing to do with us)
I go with the latter myself.
Or, knowing that Earth's ice cover changes is at the crux of the man made GW crusade, do you really think the Regime selected him because his research was in support of the GW "deniers?"