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Shell cancels oil-shale mining permit request in Colorado

Oil from shale is one of the many alternative sources of petroleum that has been researched for the past several decades but to date no one has actually brought it to mass production. As with the tar sands in Alberta, Canada, there are huge quantities of petroleum locked in other materials in North America. Unlike traditional oil drilling, shale and tar sands development is not as simple as just poking a hole in the ground. Shell is one of the companies trying to develop shale oil, but extracting the oil requires actually heating the shale to ... Read more →

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