Pablo Tittonell is a professor of Farming Systems Ecology at Wageningen University, and one of the world’s most famous experts in the field of agriculture and ecology. He advocates intensification of agriculture by making optimal use of natural processes and the landscape to meet the world’s growing demand for food.
As Tittonell notes in his talk, 97% of the world’s farms are smaller than 5 acres, and produce half of the world’s food on just 20% of the land. So the idea of yardfarms becoming a key source of food for Americans is not only possible, it sounds downright normal (at least from a global perspective). You can watch Tittonell’s excellent TEDx talk below: