sorry , forgot to add source: http://www.alternet.org/story/146686/why_planting_farms_in_skyscrapers_won%27t_solve_our_food_problems http://www.alternet.org/sto

sorry , forgot to add source: http://www.alternet.org/story/146686/why_planting_farms_in_skyscrapers_won%27t_solve_our_food_problems http://www.alternet.org/story/146686/why_planting_farms_in_s...