Fuel cells convert a fuel, usually hydrogen, into electricity using an electrochemical process. When fueled by hydrogen, fuel cells produce only water and heat as byproducts, making them a relatively green source of energy (relatively, since the majority of hydrogen currently used in fuel cells is derived from natural gas). Fuel cells could help lower greenhouse gas emissions by serving as powerplants for cars and other vehicles, where they offer longer ranges and quicker refueling than electric vehicles. Among other topics, WPI experts on fuel cells can talk about new ways to design more efficient fuel cells and emerging applications for fuel cells.