*Tar Sands Undead Walk London Ontario Canada, June 18th 2011* The main reason is that extracting the oil from the sand is so energy intensive, from the large machines to the natural gas used to melt the bitumen out of the sand. It is estimated that by 2012 the Tar Sands will use as much gas as is needed to heat all the homes in Canada ... Using huge amounts of relatively clean burning natural gas in order to produce dirty and carbon heavy oil is what commentators have dubbed