"It doesn’t mean the country’s commitments in Paris are now blown. No one knows that for sure. There are credible climate scientists who still believe it is possible but will take a lot of work."

Name one.

Do the math.
AB's 100 Mt cap on oilsands emissions accounts for nearly one fifth of Canada's 2030 emissions target (523 Mt).
Even if AB's emissions remain constant (274 Mt), that figure accounts for more than half of Canada's 2030 emissions target (523 Mt).
Leaving nine other provinces to divvy up the remainder. That works out to an average of 28 Mt each.
How could that possibly work?