Last summer, President Obama delivered a major climate speech in which he laid out his plan to reduce greenhouse gas emissions by 17 percent by 2020. He also committed to deciding the fate of the Keystone XL pipeline based on its climate impacts, stating unequivocally: "The net effects of the pipeline’s impact on our climate will be absolutely critical to determining whether this project is allowed to go forward."
While the evidence (PDF) shows that Keystone XL would result in significant greenhouse gas emissions and should be denied in its own right, it is only one of many proposed tar sands pipelines on the Obama administration’s desk. The State Department is currently preparing an environmental impact statement (EIS) for an expansion of Enbridge's Alberta Clipper pipeline, which would increase its capacity to over 800,000 barrels per day (bpd) - roughly the same size as Keystone XL. An expansion of Enbridge's Line 3 would transport up to 760,000 bpd of tar sands crude through the Great Lakes region; and a reversal of the Portland-Montreal Pipeline could bring up to 600,000 bpd through New England.
Because the tar sands deposits are landlocked in Alberta, the oil industry needs these pipelines to carry tar sands crude to U.S. refineries and overseas markets. Each one is a key part of the industry's plan to triple tar sands development to around six million bpd by 2030. Without these pipelines, much of the high-carbon tar sands would stay in the ground.
Last week, the Sierra Club and allies urged (PDF) the State Department to evaluate the cumulative climate impacts of these pipelines as part of its Alberta Clipper EIS. The National Environmental Policy Act (NEPA) requires an analysis of the cumulative environmental impacts of a proposed project combined with other past, present, and reasonably foreseeable projects. Federal courts recognize that "the impact of greenhouse gas emissions on climate change is precisely the kind of cumulative impacts analysis that NEPA requires."