Chief Environmental Officer Tom Arnold of TerraPass, a San Francisco–based organization dedicated to helping Americans decrease their carbon footprint, calculated the emissions produced by traveling round-trip from Paris to Rome by train, plane, and automobile.
Distance 1,785 miles (Paris-Milan-Rome)
Carbon Emissions 78 pounds
Verdict The clear winner, since the train runs on electric power, not diesel fuel, for the entire trip.
Distance 1,390 miles (direct)
Carbon Emissions 626 pounds
Verdict A plane produces CO2 emissions eight times greater than those from a train and releases other harmful gases, such as nitrogen oxide.
Distance 1,723 miles
Carbon Emissions 720 pounds
Verdict Surprised that driving is worse than flying?It is. This calculation is based on a small diesel car with a two-liter engine.