Nigeria: Various shots of crude oil leaking from a pipeline and flowing into a stream, hands drenched in oil.

Texas, USA. Cattle grazing in a grassy field with a 'nodding donkey' oil pump in operation in the background.

A crab crawls on oil stained rocks and runs to hide under a rock.

USA. A 'nodding donkey' oil pump in operation surrounded by leafy trees. Heat creates a visible haze effect in the air.

USA. Medium close up view of a rusted 'nodding donkey' oil pump in operation.

USA. Close-up view of a 'nodding donkey' oil pump in operation framed against a blue sky.

Barrow Island, Australia. A 'nodding donkey' oil pump silhouetted against the setting sun. A golden glow fills the frame.

A 'nodding donkey' oil pump in operation viewed through leafless twigs in Texas, USA.

Baghdad, Iraq: Wide view of the flame rising from the Doura oil refinery, oil storage depots and a close up of the installation of the refinery.

Barrow Island, Australia. A 'nodding donkey' oil pump silhouetted against the setting sun. Clouds creep across the sun's face.

Barrow Island, Australia. A 'nodding donkey' oil pump silhouetted against the setting sun. Clouds creep across the sun's face.

Siberia, Russia: Oil wells and pumps at Yukos Oil's main operation unit 'Yuganskneftegaz'

USA. Wide view of 'nodding donkey' oil pumps operating in a green oil field.

USA. A 'nodding donkey' oil pump in operation surrounded by palm trees.

Barrow Island, Australia. Low-angle view of a 'nodding donkey' oil pump operating against a blue sky background.