The world's farms may get a little greener with the introduction of hydrogen-fueled tractors that emit only heat, vapor, and water.
The agency offers $74 million to labs doing research and development, as well as cost analysis projects. Will that be enough to reassure Energy Secretary Steven Chu?
New Holland Agriculture has developed the impressive NH2, the world's first hydrogen-powered tractor.
With air pollution getting worse and oil production declining, car manufacturers are looking to alternative fuels. But what will power tomorrow's cars?
reporter's notebook A 29-year-old alternative fuel expert and writer is on a mission to make earth-friendly fuels mainstream.