how can plastic waste help grow food. this looks like a dumping ground for plastic trash. but it's actually crude material for irrigation technology. you can define much of the sarah lo has created a system that combines. cycling plastic and saving water. all it required was one great idea. and a little hole in a plastic bottle. thanks to the drip irrigation system. tomatoes survived a month of drought. despite the scorching sun. the farmer expects of. which he can sell on the local market.