responded to the threat of climate change by introducing a plan to reduce carbon emissions, "The Saskatchewan Energy and Climate Change Plan", in June 2007. History Saskatchewan has been populated by various indigenous peoples of North America, including members of the Sarcee, Niitsitapi, Atsina, Cree, Saulteaux, Assiniboine (Nakoda), Lakota and Sioux. The first known European to enter Saskatchewan was Henry Kelsey from England in 1690, who travelled up the Saskatchewan River in hopes of trading fur with the region's indigenous peoples. Fort La Jonquière and Fort de la Corne were first established in 1751 and 1753 by early French explorers and traders. The first permanent European settlement was a Hudson's Bay Company post at Cumberland House, founded in 1774 by Samuel Hearne. The southern part of the province was part of Spanish Louisiana from 1762 until 1802. 19th century In 1803, the Louisiana Purchase transferred from France to the United States part of what is now Alberta and Saskatchewan. In 1818, the U.S. ceded the area to Britain. Most of what is now Saskatchewan was part of Rupert's Land and controlled by the Hudson's Bay Company, which claimed rights to all watersheds flowing into Hudson Bay, including the Saskatchewan River, Churchill, Assiniboine, Souris, and Qu'Appelle River systems. In the late 1850s and early 1860s, scientific expeditions led by John Palliser and Henry Youle Hind explored the prairie region of the province. In 1870, Canada acquired the Hudson's Bay Company's territories and formed the North-West Territories to administer the vast territory between British Columbia and Manitoba. The Crown also entered into a series of numbered treaties with the indigenous peoples of the area, which serve as the basis of the relationship between First Nations, as they are called today, and the Crown. Since the late twentieth century, land losses and inequities as a result of those treaties have been subject to negotiation for settlement between the First Nations in Saskatchewan and the federal government, in collaboration with provincial governments. In 1876, following their defeat of United States Army forces at the Battle of the Little Bighorn in Montana Territory in the United States, the Lakota Chief Sitting Bull led several thousand of his people to Wood Mountain. Survivors and descendants founded Wood Mountain Reserve in 1914. The North-West Mounted Police set up several posts and forts across Saskatchewan, including Fort Walsh in the Cypress Hills, and Wood Mountain Post in south-central