not everything we flush goes to waste. ♪ this is the geneco biobus. on a full tank of fuel this bus can travel about 200 miles. >> abby, this is what we call a talker in everyone is talking about it but the truth is there is a lot of human waste. there's a fossil fuel problem. there's a lot of wasted gas and they have something they say runs clean, efficient, doesn't have any odor related to the actual fuel product and they say it is going to be a good thing. >> i think any time you read poop or talk about poop people start laughing. to your point, this could be a real fascinating serious thing. poop is something we're never going to get rid of it. you might as well make use of it