Canada now represents more than 20 percent of U.S. oil imports, with much of its crude coming from the so-called oil sands in Alberta Province. The process of extracting oil from the tar-like sands is expensive and dirty and activists have criticized environmental damage done in the extraction and the greenhouse gases produced in the upgrading and refining processes. As VOA’s Greg Flakus reports from Calgary, oil companies and government officials in Canada are looking for ways to mitigate the environmental impact and keep the petro dollars coming in:
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