Purchase a Hybrid
If you already have 150,000 miles on your car, considering purchasing a hybrid vehicle. This action will have the biggest positive environmental impact for you given your driving habits and lifestyle. Hybrids are very efficient for short journeys at slower speeds, running mostly on electric. With the combination of electric and gasoline you can get the best of both worlds; electrical efficiency for driving around town and the traditional car range for longer trips.
Resources
Where your electricity comes from plays an integral role in plug-in hybrid efficiency. This chart breaks down electricity sources per state as well as the annual emissions for different types of vehicles.
