IGCC

Amid its commitments to increase cooperation in developing renewable energy and electric vehicles, the U.S.-China clean energy agreement announced Tuesday by Presidents Barack Obama and Hu Jintao seeks greater collaboration on so-called “clean coal” technologies.

China and the U.S. are by far the world’s largest users of coal power, accounting for more than half of global use. As countries with vast coal deposits, they also have been leading the search for cleaner ways to burn the notoriously polluting energy source.