I wonder if the homeless tribe could be weaned away from shopping carts into harvesting kudzu. And what about leaves and yard waste? right now the lawn services in my neighborhood sweep yard waste illegally into the storm sewers.
Even better - miniaturize this process and as your mower cuts the grass, it goes into the hopper and is processed back into fuel for the engine and fertilizer for the yard!
Before anyone explains economies of scale to me, I'm joking here