The National Parks Service can significantly reduce carbon emissions by replacing a fleet of gasoline-powered pickup trucks with electric vehicles (EV), doubling the number of EV charging stations, and expanding its partnership with Clean Cities, according to the Center for American Progress.

In their issue brief, center researchers found that the Great Smoky Mountains National Park would reduce its annual carbon emissions by 40 million tons by replacing its gas-powered pickup trucks with EVs.

The issue brief also took a look at the National Park Service’s existing Clean Cities Coalition Partnership with the U.S. Department of Energy and found that more could be done to reduce carbon emissions.By expanding the Clean Cities National Parks Initiative to the Bureau of Land Management, the initiative could help park services reduce carbon emissions on other public lands and forest service lands.