December 3, 2007Coal is probably a fact of life. The problem is how to burn it. We answer some of questions surrounding the fuel and how scientists might make it more eco-friendly.Photos: Coal addictionTAGS:coal, BTU, ton, China, India, nuclear power, Russia, U.S., energy, scientist, Adobe PDF
October 25, 2006University of California at Davis unveils a digester that converts food scraps and other waste into natural gas and methane.TAGS:natural gas, garbage, ton, food