
Alberta tar sands are estimated to be 240 GtC (gigatons of carbon); see Intergovernmental Panel on Climate Change (2007) Working Group 3 report. That is about seven times greater than the cumulative historical CO2 emissions from oil use by the U.S. (36 GtC). U.S. oil use was 28% of global oil use for the cumulative amounts over the past 200 years. So Alberta tar sands contain about twice the total amount of carbon emitted by global oil use in history. Yet some people argue that tar sands are not so great that we need to be concerned about their effect on climate. They argue that only about 40 GtC of the tar sands are presently economically extractable. However, if an addiction to tar sands is established, as it would be with big pipelines, you can be confident that the … [Continue reading...]
















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