Oil-sands producers in Canada are using algae to reduce their carbon footprint and show U.S. regulators that the industry can address the environmental impact of greenhouse gas emissions from TransCanada's proposed Keystone XL pipeline. Carbon dioxide from burning natural gas is mixed with waste water and can be fed to algae, which is made into products such as cattle feed. "We're taking [carbon dioxide] and making it into a valuable product. There's a business case that can be made for it," said John Parr, vice president of Canadian Natural Resources.
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