White House approval of oil sands pipeline could spur investments in dirtier fossil fuels and worsen global warming

Canadian company that wants to build oil pipeline through six states increases lobbying in Nebraska and Washington, D.C.

Keystone XL pipeline rejection won't stop the development of Canada's carbon-rich fuel

Keystone XL backers spent more than $400,000 lobbying for the pipeline in the last quarter

Quick stats on the biggest financial backers of Election 2012

A conflict in Detroit symbolizes a larger national debate over oil company plans to step up refining of heavier, dirtier crude from Alberta.