Species that are unable to adapt have been going extinct without mankind's help for 9/10ths of the planet's history. For the remaining 1/10th, we've been a major motivator of evolution, that's true- Dodos and wooly mammoths and the like. But we are also to the point with GMO research that we can be a major cause of increased adaptation- we can speed up evolution, and likely will, because beef is tasty (among many other species that are directly useful to us, such as bees). Speaking of that last, just saw a report on OPB about a pair of beekeepers with a unique solution to colony collapse disorder- they're breeding stronger queen bees that can live through Oregon winters.
If mankind wants to survive, food needs to be our top priority. Luckily, as I mentioned someplace above I think, food production is also an answer to excess atmospheric carbon. Especially if we keep locking our own carbon up in airtight containers buried in concrete when we die.