Fuel cells are high on just about everyone's list.
While no one seems close to cranking out a production model with fuel cells under the hood, they are getting a lot closer. General Motors has a special Opel Zafira with what it calls the world's most advanced operational automotive fuel cell. The vehicle itself isn't new. Zafira is a popular Opel passenger van that GM sells in Europe. What is special is its fuel-cell stack, the component that replaces the van's engine.