in coalbed methane. Coalbed methane is natural gas that arises from coal, either through bacterial action or through exposure to high temperature. Coalbed methane supplies 7 percent of the natural gas used in the U.S. The largest coalbed methane sources in the Rocky Mountains are in the San Juan Basin in New Mexico and Colorado and the Powder River Basin in Wyoming. These two basins are estimated to contain 38 trillion cubic feet of gas. Coalbed methane can be recovered by dewatering the coal bed, and separating the gas from the water; or injecting water to fracture the coal to release the gas (so-called hydraulic fracturing). Agriculture and forestry are major industries. Agriculture includes dryland and irrigated farming and livestock grazing. Livestock are frequently moved between high-elevation summer pastures and low-elevation winter pastures, a practice known as transhumance. Tourism Every year the scenic areas of the Rocky Mountains draw millions of tourists. The main language of the Rocky Mountains is English. But there are also linguistic pockets of Spanish and indigenous languages. People from all over the world visit the sites to hike, camp, or engage in mountain sports. In the summer season, examples of tourist attractions are: In the United States: Yellowstone National Park Glacier National Park Grand Teton National Park Rocky Mountain National Park Great Sand Dunes National Park and Preserve Sawtooth National Recreation Area Flathead Lake In Canada, the mountain range contains these national parks: Banff National Park Jasper National Park Kootenay National Park Waterton Lakes National Park Yoho National Park Glacier National Park in Montana and Waterton Lakes National Park in Alberta border each other and are collectively known as Waterton-Glacier International Peace Park. In the winter, skiing is the main attraction, with dozens of Rocky Mountain ski areas and resorts. The adjacent Columbia Mountains in British Columbia contain major resorts such as Panorama and Kicking Horse, as well as Mount Revelstoke National Park and Glacier National Park. There are numerous provincial parks in the British Columbia Rockies, the largest and most notable being Mount Assiniboine Provincial Park, Mount Robson Provincial Park, Northern Rocky Mountains Provincial Park, Kwadacha Wilderness Provincial Park, Stone Mountain Provincial Park and Muncho Lake Provincial Park. John Denver wrote the song Rocky Mountain High in 1972. The song is one of the two official state songs of Colorado. See also Arabian Rocky Mountains Hazards in the Wind River Range List of mountain