There have been a number of different academic research papers written about the carbon intensity of different sources of oil. Last time I was at the committee, I mentioned that Masnadi et al. in 2018 had found that Canada's oil was the fourth dirtiest on the planet out of 50 major producing regions.
I had hoped Dr. Leach would have been able to weigh in when he was contradicted. The emissions intensity of Canadian oil has gotten worse over the last 30 years. That's because we've moved from conventional oil to more oil sands, and in the oil sands we've moved from oil sands mines to in situ.
Canada's not going to solve the climate change problem by exporting more oil. Our oil is dirty, and it's getting worse.