I'd like to add one or two quick points.
With in situ, because there is no disturbance of the land, and so on, whatever emissions there are underground are not exposed to the surface. These are advantages.
But I'd like to at least warn you against believing that in situ produces, with the same unit of energy, as much as surface mining. In the surface mine, you can produce over 90% of the bitumen. With in situ, you are producing maybe 30% of the bitumen, because of the structure of the formation, and so on.