By Megan Michelson, Outside — These mountains do way more than just recycle. With sprawling mountainside villages, water-guzzling snow machines, and high-powered chairlifts, it’s no secret operating a ski resort can be a dirty business. But in recent years, mountains around the country have started taking steps to reduce their environmental footprints by switching to renewable energy, banning single-use plastics, upgrading to water-saving snowmaking machines, and incentivizing skiers to arrive by public transportation, electric cars, or carpools. Which is all right and good, but is it enough?

To find out which U.S. ski resorts are really pushing the needle, environmentally speaking, we asked sustainability experts from organizations like Protect Our Winters, the National Ski Areas Association, and Stoke Certified for their picks. If you want to spend your dollars at a resort that’s truly making an impact, these ten spots pass the test.

On the mountain, Snowbird has taken steps to reduce the waste generated by its lodges. This winter, it’s releasing a new carpooling app to further its mission to improve local air quality by promoting ridesharing and public transportation and discouraging vehicle idling. Exhaust from the Cliff Lodge’s power plant is converted to steam that heats the lodge’s hotel rooms and swimming pool. Off the mountain, the resort recently sent delegates to Washington, D.C., to lobby Capitol Hill for climate change policy, and the resort has submitted signed statements to Utah’s Public Service Commission advocating for more renewable energy.

To read the entire article and list of resorts, go here.