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Choose Your Own Adventure: By Plane, Car, Train, or Bus?

Is flying really greener than driving? In previous work, we concluded that it’s likely not – at least for the average flight and road trip on comparable distances (300 to 500 mile trips). In a new...Is flying really greener than driving? On average, no, but it does depend on the fuel economy of your vehicle as well as the number of passengers.
Published 2015.04.30: Blog Post

Passenger Vehicle Greenhouse Gas and Fuel Economy Standards

Governments around the world are currently grappling with two distinct but interconnected issues—how to reduce emissions of climate-changing greenhouse gases (GHG) and how to reduce dependence on...
Published 2007.07.02: Publication