Cool article forwarded to us by a TG member on the various emerging technologies to derive energy from the stuff we throw away. One really interesting point in the article is the possibility of processing organic waste into aviation fuel. Currently there is no substitute for petroleum-derived avgas or kerosene, meaning the aviation industry is entirely dependent on oil.
http://www2.canada.com/trash_potential_energy_source/1493671/story.html?id=1493671