You've been researching how to live a more sustainable life, but everyone is telling you to start a vegetable patch and keep chickens. You're a broke millennial renting a tiny apartment with no outdoor space, or still living at home. Does that mean you have to wait before you can go green? No way! Let us teach you some simple ways you can green up your life on the cheap. Most of these will save you money at the same time, too. Double score!