The greenest option when it comes to eating outdoors is to bring your own reusable plates with you. But the reality is, sometimes that can be a cumbersome option. If you must use disposable plates, opt for compostable paper plates instead of plastic, foam or even regular paper plates. Compostable paper plates, which you can buy at the supermarket and have a composting symbol on the packaging, can literally be put into a household compost bin and turned into beneficial mulch. To speed up the composting process, you can soak the used plates with water before putting into the compost bin.