[DennisP]

The problem is land area.

> Today, almost half the world’s habitable land is used for agriculture. Of that, an astounding 80% is dedicated to livestock grazing and animal feed.

> We need more forests...they are home to many billions of plants, animals, bacteria and fungi whose complex metabolic interactions make up the biosphere with its crucial role in stabilizing the climate.

The article also mentions that photosynthesis is "surprisingly inefficient," which is why there's room to drastically reduce the area we need to feed our livestock.

[tuatoru]

Bannning biofuels would go a long way to reducing agriculture's use of land.

Trying to improve the efficiency of photosynthesis is one of those "what could possibly go wrong?" ideas.

[DennisP]

Sure but the idea at the link is more like fermenting our food in vats. (Or at least our livestock's food.)

[ranger_danger]

what about hydroponics? that doesn't need vast amounts of horizontal land