The latest environmental documentary to remind us of impending doom is writer/director Shannon Walsh’s even-handed survey of the people involved in the Alberta Oil Sands - a vital link in the North American petroleum market.

Interviewing workers and local people, H2Oil builds up a picture of a community that is fuelled by the black gold it draws from the Earth; a community which appears to be paying a deadly price as a result of traces of arsenic and mercury which have found their way into the local water supply.

Renowned ecologists argue that a project such as the Oil Sands is devastating the natural ecology and our insatiable hunger for energy comes at a terrible price.