The problem in the underdeveloped world is not only land availability - quite literally, agriculture there is stuck in Antiquity. That limits production much more that land availability - the Green Revolution proved that parts of the Third World could raise productivity with better techniques.

Also, from the point of view of income inequality, let's remember that the rioters in Mexico and Egypt tend to be urban dwellers - who are wealthier than land workers. The ones going hungry are the food producers.

Un roi sans divertissement est un homme plein de misères