They already are allocated that way, just not in a nice, organized manner. Humans take up much less space on planet earth than you'd initially expect.
In addition to agriculture & food production, transportation (road+rail), strip/open pit mines, and you have just take a look at
https://karolinanwk.files.wordpress.com/2012/04/garbagepatch...
The global impact of farming on the environment is revealed in new maps, which show that 40 percent of the Earth's land is now given over to agriculture.
http://news.nationalgeographic.com/news/2005/12/1209_051209_...