Dave's evolution statement is simply not true. Evolution can occur over one generation, is simply a matter of an event favor one phenotype over another. This leads to one phenotype increasing in population because of selection (survival of the fittest). 
Also it's a half of a degree, and contrary to the article it is daylight hours, not temperature that dictates the length of the growing season (we aren't talking growing tomatoes, but wild alpine vegetation).
Something that should be looked at is the practice of harvesting full curl rams, instead of less mature animals. These brutes got this big because they have the best genetics, smarter and stronger. Yet this is what ADF&G has taken out of the population. These superior animals are the ones we want to breed. Maybe we are seeing skinny less fit animals, because we have been taking the best out of the herd.