I thought this looked very intriguing. Not only here did they have ideas for using very self-sustaining biological ideas here, there were a good number. Let's see... using microorganisms that generate current with sugar, doing the same with waste and pollution products (biological and industrial, take your pick!), protein surfaces that could produce some combination of power from radiation and kinetic sources, and more bacteria that could take the waste of other energy producing bacteria in a cascading effect. Power aside, some algae in the process could take waste CO2 and give oxygen! These sources alone would run out at a point, and the effectiveness awaits testing. However, even if it isn't massively efficient, we can modify the bacteria or even chose other candidates as we please to see if anything better is available. Even using these on a short trip would conserve a decent amount of resources for life support when in spacecraft. Innovative ideas like this work sometimes, check it out!
Also, happy spring break! In addition, I forgot a few months ago... happy winter holidays. There, I finally said it. To all the people who come here, have a nice break, I'm going to assume that if you come here you deserve it :).