Shell and BP claim to be environmental stewards, though both companies are investing heavily in tars sands - an energy source that uses more energy and produces more CO2 emissions than traditional oil (see our exposes on Shell and BP). This week, Grist published images of the of tar sands and their impacts -- including deforestation, pollution and poisoned fish. Take a look: http://www.grist.org/feature/2008/12/18/tar_sands/?source=daily