+1 to that. A 15 minute walk around the block, or through the park, picking up any litter along the way, times a billion, means you won't see litter, and you wo

+1 to that. A 15 minute walk around the block, or through the park, picking up any litter along the way, times a billion, means you won't see litter, and you won't have to pay quite as many sanitation workers.