The conversion of our energy supplies to sustainable resources isn't advancing quite as fast as we may wish, and in the meantime, the people who seem to be desperate to burn even more fossil fuels than we are burning already have come up with ingenious ways of getting even more coal and gas out of the ground.
I've written a feature rounding up some alternative energy sources, including both green and not quite so green ones, which is out in Current Biology today and freely accessible to all.
Looking for alternative energy sources
Current Biology, Volume 22, Issue 4, R103-R106, 21 February 2012
Brown algae are one of the options considered for the production of next generation biofuels. (Photo: Bjørn Christian Tørrissen/Wikipedia.)