Watch the trailer for H2Oil, a documentary on oil extraction in the Alberta tar sands

Watch the trailer for H2Oil, a documentary on oil extraction in the Alberta tar sands. Oil or water – that's the question raised in H2Oil, the third in a series of films about oil extraction in the Alberta tar sands. Extra members can get a 2 for 1 deal on tickets to a screening on 15 June in 20 VUE cinemas around the UK