Something not often mentioned in the context of a carbon tax - it needs to be taxed at extraction, not consumption. The problem isn't burning petroleum as such

Something not often mentioned in the context of a carbon tax - it needs to be taxed at extraction, not consumption. The problem isn't burning petroleum as such - the problem is where it comes from. We will go carbon-neutral much more quickly if the economy is incentivized to produce "green oil". And if it's still being dug up, it doesn't matter how you tax consumption, someone's getting that oil and burning it, possibly for cheaper than they were before. Unfortunately, the top 5 oil producing companies are based in Saudi Arabia, Russia, Kuwait, Iran, and China respectively. It's going to be a challenge to persuade them all to stop digging.