Cars have a come a long way in efficiency over the past decades, so a new car can also be an environmental statement, if it replaces an older model.
2012 Tesla Model S
The Model S is essentially the car of the future, a beautifully designed curvy sedan built from the ground up as an electric car. It features connected cabin technology and it can even be updated remotely, adding features so an older car is as good as the newest.
Chevy's appropriately named Spark uses a pure electric drivetrain that gives it more power than its gasoline-fueled sibling. Although only appropriate as an urban vehicle, it zips around easily without a drop of gasoline.
Ford's midsize sedan boasts fuel economy in the low-40s with its hybrid drivetrain, but never feels underpowered. An extensive array of cabin electronics and driver assistance features makes this one as modern as they come.