Call it a no-brainer—today’s decision by environmental and Native American groups to oppose a pipeline that would move the dirtiest oil on Earth into the United States from Canada.

Earthjustice attorney Sarah Burt, speaking on behalf of those groups, vowed to take legal action challenging the State Department for permitting the Alberta Clipper pipeline to carry Canadian tar sands oil from Alberta to Wisconsin.

"The State Department has rubber-stamped a project that will mean more air, water and global warming pollution, particularly in the communities near refineries that will process this dirty oil," Burt said.."The project’s environmental review fails to show how construction of the Alberta Clipper is in the national interest. We will go to court to make sure that all the impacts of this pipeline are considered."