> Needs an energy source Sun. Fission. Fusion. > you'd have to come from an entirely different angle Not me personally, but tens of billions of new people wh

> Needs an energy source Sun. Fission. Fusion. > you'd have to come from an entirely different angle Not me personally, but tens of billions of new people who would be born in the next couple of hundred thousand years. > If there is some totally out-of-the-blue breakthrough If in 1900-2000 food production increased 5x then it is reasonable to expect that in the next 100 years food production may increase 5x again (or more if needed). It looks like you want to have enough food now (in 2015) in order to be able to feed world's population in 2215. Why do you need to have that food 200 years ahead of the actual demand?