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There is a new sponge that researchers hope could absorb greenhouse gases from power plants one day. In a recent study, scientists at Lehigh University created a new material that pulls carbon dioxide and methane selectively from a stream of other gases. In theory, the new spongy substance could sop up heat-trapping gases emitted from the burning of coal or natural gas

NATIONAL HARBOR, Md.--Silicon translates sunshine into electricity--and Earth receives enough sunshine in a daylight hour to supply all of humanity's energy needs for a year. But despite being as common as sand, photovoltaic panels made from silicon--or any of a host of other semiconducting materials --are not cheap, especially when compared with the cost of electricity produced by burning coal or natural gas.