Oil sandsThe production process wastes enormous quantities of fresh water, tar sands use 2.4 barrels of freshwater for every barrel of tar sand produced, companies get the water from the Athabasca River one of North America largest free flowing rivers and nearly all of it ends up too contaminated to return and is one of the most destructive carbon-intensive and toxic fuels on the planet producing 3 times as much greenhouse gas pollution as conventional crude oil does and the oil is low grade having to sell at discount so I dont know what you have read.