This week our own Robert Johnson is headed north to investigate one of the most controversial energy projects in the world: the Canadian oil sands.
Oil sands are a naturally occurring mixture of sand, clay, water and bitumen.
Bitumen is a heavy, viscous oil that is solid at 50 degrees Fahrenheit and acts like cold molasses at room temperature.
Oil sands can be found in many places around the world, but the largest deposits are in Venezuela and Alberta, Canada.
There are 175 billion barrels of proven oil reserves in Canada, second only to Saudi Arabia and Venezuela. Of that number, 170 billion barrels come from Alberta's oil sands, which are found in three main deposits: Athabasca, Peace River and Cold Lake.