Honda's zero emission car from Japan will be seen in California, USA this 2008. Some of the early customers are celebrity actors and actresses. It is fueled by hydrogen and electricity, emits water as by-product and none of the greenhouse gases.
Hydrogen can be obtained from, of course, refilling stations, but is also obtained from methane or natrural gas, bio-mass, etc. Honda says soon, people can have their own home hydrogen energy generators that uses natural gas.