Coastal states on both sides of the country are teaming up to put 3.3 million zero-emission vehicles on the road within 12 years. Currently, there are about 165,000 cars making up the zero-emission crowd, including battery-electric vehicles, plug-in hybrid-electric vehicles, and hydrogen fuel-cell electric vehicles. About a third of today’s zero-e vehicles are in California, one of the states hoping to boost their economy and reduce heat-trapping greenhouse gas emissions with this pledge. Other states include New York, Connecticut, Maryland, Massachusetts, Oregon, Rhode Island and Vermont. See how they plan to make it happen.