They're a top predator. The disappearance of a top predator tends to have widespread negative impacts on an ecosystem.Arctic Melt
+An ice-free Northwest Passage, providing a shipping shortcut between the Pacific and Atlantic Oceans (Kerr 2002, Stroeve 2008)
-Loss of 2/3 of the world's polar bear population within 50 years (Amstrup 2007)
Now why is that a negative? Why should I care about polar bears?
In any event, this was only one of six negatives listed. Even if you didn't agree with one of the negatives, there are others there. But one they didn't mention is that the melting of arctic sea ice makes the arctic darker, which causes greater absorption of sunlight, which accelerates warming.
Convenient? Or simply changing views in response to the evidence? Because the global average temperature trend hasn't decreased at all. If anything, it's accelerating.Nobody was saying global warming was causing more climate variation a few years ago, then when the previously noticable warming trend of 2000-2008 gave way to nasty winter storms, then it was due to global warming that these weather patterns occured...too convenient.
Winters like this one and the previous one were normal some fifty years ago. Now they're rare events. Sounds like he hit the nail on the head to me.Not to mention stuff like epicstruggle quoted where climate scientists said that we'd say goodbye to winter in a few years isn't really helping their credibility.