An interesting proposal, and as vertical urban farms and other such advances become commonplace, probably a realistic one.

As a point of reference, New Zealand already has about 25% of its land area in national parks and other protected natural areas, and this is in a country where agriculture is traditionally one of the largest industries.

Originally shared by David Brin

In Half Earth, E. O. Wilson suggests that humans set aside roughly 50 percent of the planet as a sort of permanent preserve, undisturbed by man. I portrayed this happening in the future… and it will… once we get past these crises and use asteroids to get rich…

http://www.nytimes.com/2016/03/01/science/e-o-wilson-half-earth-biodiversity.html?action=click&contentCollection=science&region=rank&module=package&version=highlights&contentPlacement=7&pgtype=sectionfront&_r=0