“Cellulosic ethanol”:http://en.wikipedia.org/wiki/Cellulosic_ethanol looks to be a promising alternative to fossil fuels. I haven’t heard much of it here, but apparently it’s very hot “in the valley.”:http://www.siliconbeat.com/entries/2006/02/26/ethanol_in_the_silicon_valley_spotlight.html From what I gathered: * It’s clean to produce. * It’s giving out less greenhouse gas when use. * It’s “energy effective.”:http://www.mercurynews.com/mld/mercurynews/13967129.htm