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Article updated: 1/18/2013 8:07 PM

Tar sands waste said to warm climate more than coal

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Yoko Ono, left, and her son Sean Lennon chat aboard a bus Thursday on the way to visit fracking sites in Pennsylvania.

Associated Press

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Opening a new front in a fight to persuade President Obama to reject the Keystone XL pipeline, which would carry oil sands from Alberta to the U.S. Gulf Coast, environmental groups on Thursday released a study that found refining the heavy material will create 5 billion tons of petroleum coke, or petcoke, that's used by power plants, aluminum factories and steel mills. Compared with coal, petcoke is cheaper and releases more carbon dioxide when burned.
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