One thing about global warming is how hard it is to make predictions. At first, it was supposed to be a slow process with the negative effects appearing generations down the road. That scientists appeared to have blown it should be a great comfort to the deniers, except that the scientists may erred by being too optimistic. Never-the-less Deniers will find a way to spin that to avoid doing something. Then there were cautions about disrupting ocean currents. While scientists didn't botch this too bad, the initial response from much of the public was, "Ocean currents? Who cares? Lets worry about things that will actually affect us."
Several years ago, a secretary where I worked happily stated in the lunchroom that in 200 years, we would have palm trees growing in Portland, Oregon. Oh Great! Warm and balmy in Portland. I wish the whole world had nothing but palm trees. This would be great except that while Portland is 65 miles inland, it's only 50 feet above sea level, but not to worry. There's not enough ice around the poles that could melt and raise the sea level 50 feet, right?
And while what we do know about global warming is bad enough, it's not unlikely that some unexpected GW consequence we never saw coming will be the one that finally ends the party. Bacteria? Never saw that coming. Of course, what happens in the tundra won't have that much effect on us. It's only Eskimos and Reindeer up there, and we don't need them for anything. Besides, the Eskimos could raise camels instead, and they would probably rather do that anyway.