Clean coal : green and lean

The place of coal in a low-carbon world is still being debated. With 1,000 billion tons of global coal reserves and hundreds of coal-powered plants being developed around the globe, "King Coal" is not expected to be knocked off its perch as the world's lowest-cost power supply in the coming decades.

Yet clean coal technology – coal with low or zero pollutant emissions – has not proven to be cost-effective on a standalone basis. All six of the world's high-efficiency integrated gasification co