(AP ) Piles of coal are shown at a power plant in Thompsons, Texas. The plant, which operates natural gas and coal-fired units, is one of the largest power plants in the United States.
Silver lining? Greenhouse Gas Could Be Vast, Untapped Source of Energy
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JULY 30, 2013
John Roach, NBC News

The greenhouse gas carbon dioxide emitted from power plants and other industrial activities around the world is a vast source of untapped energy, according to new research that describes a proof-of-concept technique to harvest it.
Akin to harvesting energy from the wind, this combination of chemistry and mechanics would generate electricity from the carbon dioxide (CO2) already flowing out of plants. While it wouldn't destroy the CO2, it would pull far more energy from existing waste gas. It could arguably even enable plants to resist scaling up and becoming more wasteful, just to keep up with demand.
Like wringing energy from the wind, harvesting energy from CO2 does not increase greenhouse gas emissions. "For the same CO2 emissions," he said," you get more energy."
Read more: NBC News