Scientists are looking for alternatives to fossil fuels . Former NASA engineer John Mankins plans to launch solar power satellites into space . Germany , France , Portugal and U.S. world leaders in wave power . But he notes that there are always hazards in using nuclear material . Danish inventor Jens Dall ##gaard creates a furnace that can burn wet coal .
Scientists are looking for alternatives to fossil fuels . Former NASA engineer John Mankins plans to launch solar power satellites into space . Germany , France , Portugal and U.S. world leaders in wave power . Danish inventor Jens Dall ##gaard creates a furnace that can burn wet coal .