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We burn monstrous amount of oil, Conservation of mass.

A liter of oil produces 3 kilos of CO2, density of rocks is 3-4 kilos per liter.

Imagine. For each tanker truck that goes to a gas pump, you need to carry away a truck of the same size full of rocks.

Rather nice image for the idea of "not sustainable".

There is no physics-breaking technofix that can make those tankers full of oil sustainable.