The Accord offers multiple versions including gas, hybrid and electric, and even the largest petrol engine V-6 model gets an impressive 34 miles per gallon (mpg) for highway driving.
Its rivals for the yesterdays environmentally-friendly prize, announced the day before the Los Angeles show opens to the public, were the Audi A6 TDI, the BMW 328d, the Mazda 3 and the Toyota Corolla.
The diversity of this field of finalists illustrates not only that green has gone mainstream, but also that there is no single approach to achieving ever-higher levels of fuel efficiency and environmental performance, said Ron Cogan, publisher of Green Car Journal, which hands out the prize.
Its accommodating, featuring the comfort and functionality expected of a mainstream sedan and incorporating the latest in on-board electronics and safety systems, although while delivering a satisfying driving experience.
Importantly, it excels with the versatile approach to environmental leadership.
American Honda senior vice-president Mike Accavitti said the car offers something for everyone, adding that the green prize highlights our shared vision of the future of low and ultra-low carbon emissions.
Last years award was won by the Ford Fusion, following the Honda Civic Natural Gas and the Chevrolet Volt in previous years.