Sulphur which has to be extracted from the raw bitumen from tar sands piled up in huge mountains by the Syncrude upgrader plant near Fort McMurray, Alberta, Canada. The tar sands are the largest industrial project on the planet, and the world's most environmentally destructive. The synthetic oil produced from them is 3 times more carbon intensive than conventional oil supplies, a disaster for the climate. They are responsible for the second fastest rate of deforestation on the planet. Second only to the amazon Rainforest. They produce millions of litres of highly polluted water every day which leaches out into the Athabasca river and has serious health impacts on First Nation peoples living downstream.