Clean coal which was a $10 billion subsidy issue in the last election is developing. It involves capturing carbon dioxide by first burning it with liquid oxygen. Buy LOX stock. I like Air Liquide. There are two technologies: one rich: they inject steam, use heat to split off the oxygen to burn the coal and use the hydrogen to generate more electricity. The other lean: just use more LOX.

Both are idiotic from an economic standpoint. To add a hydrogen system and make the coal crazy hot enough to split water will use a lot of LOX at $1/gallon or so. Clean coal is an attempt to minimize the carbon output per electricity instead of the carbon output per money. Better than producing 1,000,000 barrels of CO₂ via clean coal, would be to generate 3,000,000 barrels of carbon dioxide enriched air. Underground storage of air is a lot cheaper than buying hundreds-of-dollars-a-ton of LOX to burn $20/ton coal. We ought to be able to achieve sequestration for under $5/ton of CO₂. And the plant modification is low-tech. Just direct the exhaust into a pipeline to inject it into the ground.