Suncor Energy's (SU) Millenium oil sand mining-and-refining site, with its tailing pond and earthen dam, lies adjacent to the Athabasca River near Fort McMurray, Alberta. The Athabasca deposit is the world's biggest reservoir of crude bitumen, a semi-solid form of crude oil. The proposed Keystone Pipeline would run from here to various destinations in the U.S.

Photograph by Robbie McClaran/Redux