Watch this video about coal fires on HowStuffWorks. You may not be aware that coalfires, both natural and man-made, generate large amounts of carbon dioxide. In China alone, the estimated amount equals that of the U.S. transportation sector, according to Taku Ide, a PhD student at Stanford University, who is on a quest to extinguish these fires. See how coal fires can be extinguished in this video from PodTech.net.