"Life adapts. That's what it does."
Actually the fossil record suggests otherwise, if the amount of change is too abrupt. In that case most higher life forms go extinct because they are too dependent upon specific lower forms of life that often can not adapt. Most organisms have very specific environmental requirements. Go outside of those physiological limits and they die. Humans aren't much different in many respects. We do a lot of things, but seldom do we really get too far out of our physiological comfort zone. A world that in 80-100 years has temperatures of 130-140 degrees F in the shade for weeks on end will be a whole experience.
Keep in mind that this time its totally different, because of the rate at which CO2 is rising. Its going up more than 26 times faster than during the Paleocene-Eocene Thermal maximum, which changed the forests of what is now northern Wyoming from redwoods to palm trees in a couple of thousand years. It will be hard to imagine many organisms surviving that kind of change over the course of a few hundred, much less most of their pollinators.
"Do you think Canadians and Russians live in fear of global warming?"
They should. The vast bulk of the warming that will be seen is occurring in the Arctic and generally speaking even Russians and Canadians need to eat. With food crops under threat, they may well find themselves stressed as well. Some 56,000 Russians died in the heat wave in 2010. Some 40,000-50,000 Europeans died from a similar heat wave in 2003. If the Lake El’gygytgyn results are a direct indication that the global climate sensitivity is 8 degrees Celsius which it appears to, rather than what people have been indirectly inferring and using in their climate models, then its pretty clear that we can expect many more to die as we now move into the Arctic amplification phase of global warming.
As for the high latitude North providing more arable land, don't count on it for several reasons. 1) Arctic soils are very poor, 2) few commercial plants can tolerate the long winters so most crops that require more than one year to produce, such as fruit trees won't be among them, 3) just because the Arctic is warming doesn't mean that it may not yet see many days with freezing temperatures, so most plants adapted to more southern latitudes simply won't be able to adapt to growing conditions which are interrupted by severe frost in an unpredictable way, 4) it may be almost impossible to take pollinators with them given the different wind and percipitation/abruptly changing temperature regimes. Keep in mind many plants used for human consumption, such as corn, rice, coffee are tropical or tropical highland species, 5) many others such as wheat are highly susceptible to rusts and fungi and will likely fare poorly as there is too much moisture in the atmosphere such as in early spring, and 6) simply because you have high latitude does not mean that abundant, year around sources of freshwater will be uniformly available throughout the entire landscape.
Obviously, a lot depends on how fast the change.