It looks like the best we can do is set aside land for "Nature Preserves" and "Wildlife Preserves"; however, the gene-pool in such preserves is depressing.
Very true, and if we are going to allow those genomes to survive climate change (no matter which direction it goes) we need to have connectivity between reserves. Many native plants don't move so easily across miles of farmland and highways and housing developments, and if they can't thrive right where they are at, they are doomed if the local climate changes faster than they can move and adapt to the changes.
Things like birds disperse easily so would find suitable habitats more readily, but some species like martens and fishers and their prey have only islands of habitat in some areas. This is where our numerous national parks and national forests afford refuge for many species, as often moving up or down in elevation has the same effect as moving in latitude.
We are very fortunate that our forefathers set aside vast tracts of public land. But with human population pressures increasing, it will be only a matter of time before the clamor will begin again to try to sell some of it off, like Reagan proposed during the Sagebrush Rebellion.