Transportation is now the largest source of carbon emissions in the United States. In many U.S. cities and towns, the personal automobile is the single greatest polluter because emissions from millions of vehicles on the road add up. To reduce greenhouse gas emissions, individuals can use cleaner modes of transportation to get around, from public transit to biking and walking.
DrivingModern transportation relies heavily on petroleum, and passenger cars and light-duty trucks (i.e. sport vehicles, pickup trucks and minivans) contribute half of the carbon dioxide emissions from the U.S. transportation sector. Burning one gallon of gasoline creates about 20 pounds of CO2—which means the average vehicle creates roughly 6 to 9 tons of CO2 each year.
It turns out that we can do a lot to reduce the impacts of driving, starting with the type of car we drive. Over the average lifetime of an American car, a 30-mpg car will save roughly $3,000 in fuel costs compared with a 20-mpg car. When buying your next car, pick the least-polluting, most efficient vehicle that meets your needs. Just switching from a vehicle that gets 20-mpg to a vehicle that gets 25-mpg car reduces your greenhouse gas emissions by 1.7 tons annually. Check out the Environmental Protection Agency’s Green Vehicle Guide and the Department of Energy’s Fuel Economy website and Model Year 2017 guide for information about the emissions and fuel economy performance of different vehicles.
Electric vehiclesElectric vehicles (EVs) offer a low-carbon alternative to gasoline-powered vehicles. Both the private and the public sectors are working to reduce barriers and expand EV sales worldwide. Automakers are competing to reduce battery costs (which make up most of an EV’s additional cost), increase battery range, and offer a wider range of affordable EV styles, including SUVs and minivans.
EV adoption varies by country, region, and city, but innovative public policies are encouraging people to purchase the vehicles. For example, California allows EV drivers to use HOV lanes even if they are driving alone. In Portland, Oregon, an extensive public charging network may have helped spur all-electric vehicles sales to three times the average U.S. all-electric vehicle uptake rate.
An EV can reduce your carbon footprint and save you money over the lifetime of the vehicle. Some EV questions to consider:
Optimal driving techniques can also help you cut emissions and save money in a gasoline-powered car. Hard acceleration and braking can waste fuel and lower your mileage by 33 percent on the highway and 5 percent around town, according to the Department of Energy (DOE). DOE studies show that for every 5 miles per hour you drive over 60 miles per hour, fuel economy is lowered by 7 percent, so go easy on the brakes and gas pedal. You can also lower impacts by reducing time spent idling, and using overdrive and cruise control. And because a properly-maintained vehicle can improve your gas mileage and fuel economy by 4 percent, remember to have your vehicle tuned up, tires inflated, and oil and air filter cleaned out regularly.