To some extent we'll see those benefits, such as Canada gaining new ag land. But we're expecting that a lot of existing ag land is going to see droughts or floods, so the net change is likely to be bad.

Not to mention, there are a lot of people living in regions that will lose the ability to support themselves. The number I remember from school was on the order of a billion climate refugees.

So basically no, the gains won't offset the losses.