A five-year pilot project to reduce trash flowing from national parks to landfills has cut more than 16 million pounds of garbage from that waste stream.
The Don't Fill The Landfills project was launched in 2015 at Denali, Grand Teton, and Yosemite national parks by Subaru, the National Parks Conservation Association, and the National Park Foundation with the help of local communities and concessionaires. Through an effort to reduce and recycle wastes, those three parks saw substantial reductions in the garbage that had to be trucked to landfills.
https://www.nationalparkstraveler.org/2020/09/initiative-helps-national-parks-keep-millions-pounds-trash-out-landfills