Considering that we are still moving out of an ice age I don't really expect are burning oil to be an issue that will have a noticeable effect. Consider also that crops do better as CO2 concentrations rise. If anything the world can easily use and withstand a little warming.

One other interesting thing to consider, we really are not even using a good percentage of land that could grow food. There are many parts of the world that because of conflict do not fully use the lands they have and in many western nations the majority of land is held by government and not open to use.

So the dramatics will need to wait another day