WASHINGTON — As Congress debates legislation to slow global warming by limiting emissions, engineers are tinkering with ways to capture and store carbon dioxide, the leading heat-trapping gas.
But coal-fired power plants, commonly identified as the nation’s biggest emissions villain, may not be the best focus...
Carbon dioxide typically makes up only 10 percent to 12 percent of a coal plant’s emissions, they note, and the gas is so mixed with pollutants that it is difficult to separate.
Cheaper strategies for sequestering carbon dioxide could prove especially important if Congress passes a law setting up a so-called cap-and-trade system...
Last month, the Energy Department announced $44 million in grants to develop the technology, known generally as carbon capture.
The advantage is that if a tree is cut down and burned in a boiler, a new tree can grow in its place, and absorb carbon dioxide from the atmosphere. That makes the process “carbon negative;” for each ton burned, the amount of carbon dioxide in the atmosphere will decline...