Quick—what country exports the most oil into the United States? Saudi Arabia? Venezuela? Iraq?
Nope. Canada. And the oil we get from our northern neighbor is about the most ridiculous energy bargain imaginable. Most of the stuff comes from vast deposits of tar sands in Alberta. Eventual emissions of CO2 are three times as much as from an equivalent amount of conventional crude oil. Mining the sands requires razing wide expanses of boreal forests and the peat soil beneath the trees, an inconvenient substance the industry sometimes calls "overburden." This is clearly disastrous for wildlife as well as for groundwater and air quality.
And now the capper—extraction of the tar sands and conversion to usable oil is so energy intensive that Canada is considering building nuclear plants to generate the electricity necessary to mine and refine the sands. This would be, according to a series of articles and links gathered by Grist magazine (make sure to look at the photographs), the first time so-called "clean" nuclear electricity would be used to provide decidedly unclean fossil fuels to keep global warming rocketing along on track.
People really are nuts.