Is it easier to avoid a new project than to cancel existing ones?
Yes.
Which is why we would be saddled with both sources of emissions.
Dude! They are tapping into their heavy oil now too. Google a little and see what is going on there right now and why OPEC pegged oil at $100ish a barrel for the past 3 years to pay for the biggest oil project the world has ever seen.
Anybody who isn't working in a call center in India is working in the Middle East ramping up output in Saudia Arabia,other Arabs, Africa and rebuilding southern Iraq.
I know you weren't around last time OPEC played games on our economy. It's what kicked off the oil sands to begin with. This time we had the leap and forced them to invest their whole nut on deep heavy crude.
Don't worry, you'll get your green electric urban buggy and $15 a year to operate gas fireplace and piss poor frequency wind power that ruins electronics before their time. It will happen when our oil flows to EU and Asia we'll be able to afford all the green goodies.
Gasoline and heating oil use is going to plummet. NG will skyrocket
There are far better and more valuable products from oil than gasoline for cars. Equipment and Global logistics needs diesel and bunker. It's pointless wasting Saudi sweet on it.

.
The more products that can be made from bbl of oil the more valuable it is.
I'll let you in on something.
There is a mineral far more valuable than oil, uranium, copper, silver, gold or platinum that decides a Nations worth than all of the latter combined.
Sulphur.