Reply to comment

"How will warmer temperatures and more CO2 result in crop failure, since there is nothing a plant likes more."

Crops, like all plants, are adapted for a specific climate. When the local climate changes, they no longer grow effectively in that location. You probably can find someplace else to grow them, but there are costs involved. Similarly, when the oceans flood New York, we can move New York somewhere else, but that won't be cheap or easy.

Whether the total output of food will go up or down depends on exactly how we adapt.