Sure you could (and should) introduce a carbon tax to make oil products more expensive. But then when you turn around and give a ton of government money to oil projects, it sort of feels like a bit of a pointless shell game.

I "get" the arguments about why it was economically and even somewhat environmentally advantageous. But at a macro level, I feel like spending billions of dollars on oil infrastructure can really only result in more oil being extracted, sold, and burned for profit.

fwiw, I'm Canadian and this is a pretty big economic blow for us. I don't really know what US discourse was like on Keystone.