Its not cornucopicism, its merely the certainty that the future is not going to be a copy of the past in any way, shape or form. Peasant farming is far less productive, (and also far more ecologically destructive) than industrial farming is, and farmland under the plow is the limiting factor on our food production. I am not certain that the future will have enough food, I am merely certain that regardless of what happens its not going to involve regressing to primitive farming techniques. If climate change wrecks the grain belts- well war will provide for all, either in victory or in death.