The Keystone XL Pipeline is a proposed oil pipeline that would transport crude oil from Canada to various locations in the United States. It is an extension of the existing Keystone Pipeline System, designed to increase the capacity for transporting oil from the Athabasca oil sands in Alberta to refineries in the U.S. Gulf Coast. The project has faced significant debate and opposition due to environmental concerns, particularly regarding potential oil spills and greenhouse gas emissions. Supporters argue it would create jobs and enhance energy security, while opponents emphasize the risks to ecosystems and climate change.