There is the issue of rate. Climate change is happening at a rate comparable to human lifespans. In the past episodes of climate change, we're talking 10's of thousands of years for a "rapid" change. Few ecosystems can adapt as quickly as the climate is changing. Coral reefs are a good example. They are sort of a canary in the coal mine thing. Ocean acidification, temperature rise, and human pollution are stressing them to the max. The same issue applies to land environments. Humans cannot adapt to a loss of arable land. Humans cannot adapt to desertification and no fresh water. 

Just because you cannot imagine a solution that is not dystopian does not mean it does not exist. One thing is clear - the present course of inaction is not a plan. To shrug and say "We'll adapt" is to deny reality.