If the goal is to "save the world" let's put the horse in front of the cart.  Find a way to limit and decrease the world population first because no amount of food production will offset an open-ended population number.  My best example ... dry yeast added to a cup of warm sugar water in prep to make bread. The yeast grows until it runs out of sugar or dies in its waste (ethanol).  And humans don't seem to control their population numbers any better than little yeasties.

In the end, might makes right. Nothing has changed since the caveman.