What is left is 3% of habitable land, or 1,110,000,000 acres, which is surely already accounted for as infrastructure/extraction, roads, or residential. And we didn't figure in tundra/taiga. There is no spare habitable 7 billion acres on Earth. The world can not live that lifestyle. Not because Al Gore said so, but because the math and science doesn't work. You can feed your family that way because you are lucky enough to be born in the time and place you have been born. If everyone in the world did that or tried to, chaos, starvation, and war would follow. It is why the growing red meat appetite and affluence of China is alarming.