Granted there will be tradeoffs, but overall I think the U.S., Europe, and Russia will benefit.<quoted text>
A couple of problems....warming changes weather patterns, which may leave previously fertile areas colder or in drought status while opening up other areas which weren't open to agriculture. This could be an even trade, but will disrupt societies and politics.
Second, and much more significant, it WILL leave world sea levels higher, possibly MUCH higher depending on how warm it gets. Several feet would flood all low-lying coastal areas leading, again, to massive social and political disruptions.
And there's the distant possibility that RUNAWAY warming could make the Earth uninhabitable, the 'Venus effect.'
Not sure this is something we want to gamble with...
I don't care about the "massive social and political disruptions" in the cesspools of the world. They do a good enough job of that as it is. Climate change won't change that fact much if any, it will just give them an excuse to blame us with the inherent inferiority of their social systems.
Flooding will not be that big a problem for us. Sure, the beaches might go under, but even if all the ice melted (not likely) we wouldn't have "Water World" because there's not enough water locked up in ice to do that. There's only enough to raise sea levels about 200 feet or so. Realistic projections are only saying climate change could raise sea levels 20 feet.
A "Venus effect" is something out of science fiction.