They've released two new reports in Washington that claim the pipeline would be instrumental in triggering a tripling of production in Alberta's oil sands by 2030 and would contribute more greenhouse gases than originally estimated.
They're hoping to persuade the Obama administration to reject the construction of the northern leg of the pipeline that would carry oil from Alberta.
"We don't view this as an inevitable approval," said Danielle Droitsch from the U.S. environmental group Natural Resources Defence Council. "With climate change chaos sweeping the nation, this new research shows why the Obama administration should stop the Keystone XL tarsands pipeline in its tracks."
The U.S. State Department is expected soon to release its Supplemental Environmental Impact Statement on the new route proposed by TransCanada Pipeline for the northern portion of its XL pipeline through Nebraska.
The project was rejected by President Barack Obama a year ago after a public outcry over the possible environmental impacts on Nebraska's sensitive underground aquifers.
In the meantime, the company received approval to split the project in two and continue the construction of the southern section from Cushing, Oklahoma to Houston, Texas.
Emissions 'underestimated by 13%'
Speaking at the National Press Club in Washington, the coalition of environmental groups released a report that claims oil sands crude is a lot dirtier than the industry lets on.
Oil Change International says its report “Petroleum Coke: The Coal Hiding in Tar Sands” shows the by-product of the oil sands bitumen should be included in the well-to-wheel analysis of the greenhouse gas footprint of the oil sands.
Petroleum coke or petcoke is produced when the bitumen is refined. It’s a solid, coal-like substance that is used in U.S. refineries as cheap energy.
“The burning of this coke has not been calculated into the overall calculation of emissions,” said Lorne Stockman, research director at Oil Change International.
“The total emissions have been underestimated by at least 13%. Pet coke is making the tar sands dirtier and cheaper,” he says.
Stockman estimates that replacing 830,000 barrels per day of conventional crude with Alberta’s oil sands crude in the Keystone pipeline would increase U.S. emissions equivalent to adding nearly six million cars to the road every year.
Keystone XL 'enables' growth
The Pembina Institute also argues that emissions will go up as direct result of the Keystone Pipeline. Its new report disputes the State Department’s original conclusion that if the Keystone weren't built, the oilsands would ramp up anyway.
“The last EIS (Environmental Impact Statement) said there would be no increase in climate emissions, because other transportation options will simply move ahead. That's not true. The Keystone XL is the biggest and most imminent pipeline on the table,” said Nathan Lemphers from the Pembina Institute.
"Keystone XL will have the greatest impact and will allow a 36 per cent increase in oilsands production," he said. "So that tells the story that the pipeline is a key enabler of oilsands growth.”
Environmental groups are hoping to tap into public sensitivity to climate change after a summer of drought in both Canada and the U.S. Last fall's Hurricane Sandy was linked to extreme weather caused by a changing climate.
The groups are planning a major protest outside the White House on February 17.