Seems likely that within our lifetime multiple countries in europe may turn into deserts, and there is little we can do against it except for maybe attempt to terraform the climate by seeding clouds or changing ecosystem flora to something resilient in the face of 40C weather. Losing a huge amount of food production would be my greatest concern.

The thing is, we could survive with a lot less food production. We just don't want to, since animal flesh is so tasty.