Each year, J.D. Power and Associates comes up with its Automotive Environmental Index of the top 30 environmentally friendly vehicles. The roundup combines U.S. Environmental Protection Agency (EPA) ratings with customer research related to fuel economy, air pollution, and greenhouse gases. In 2007, 10 hybrids made the top 30, compared with 8 hybrids in the 2006 list. Here they are in all their green glory.