The two lands that produce the world’s highest-cost-to-produce oil are Canada and Venezuela. Both extract their oil overwhelmingly from tar-sands, which is the dirtiest of all oil and thus (by far) the costliest to refine. (Thus, it’s called “extra-heavy crude”, and that is the least desirable type. It’s also the type that, in a global-warming world, should remain in the ground, never be burned at all, as will also be explained here) […]

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