Technology now in limited use removes about 90 percent of carbon dioxide from the smokestacks of coal-fired power plants, but energy experts say cost remains the chief obstacle to bringing the "clean coal" touted by President Donald Trump into the mainstream.
Industrial-scale carbon-capture projects have begun operating recently in the U.S., Canada and Abu Dhabi.
In Congress, bipartisan bills with 64 co-sponsors would increase carbon-capture tax credits.
Federal scientists are exploring ways to cut costs and to inject more liquefied CO2 back into the Earth.
They expect to see second-generation technology with lower costs for large power projects by 2020, though they acknowledge routine use of the technology is at least another decade away.
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