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Originally Posted by oil pan 4
The CO2 would be injected in the ground under high enough pressure to stay liquid.
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The problem is, you've drilled all these holes (AKA "oil wells") in the overlying rock formation. Once the seals on a few of them fail (as they will, over hundreds to thousands of years), the pressure will be relieved, the CO2 will turn to gas and come out.
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Originally Posted by stovie
They already have methods for making fuels like methanol from co2 and co!
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Well, sure. They're called plants :-) And the atmosphere already holds a good deal more than they need.
The problem with making fuel from CO2 is this little thing called conservation of energy. Once the petroleum (or wood, corn-based ethanol, or whatever) is burned, you've extracted the energy from it. You have to put more energy back in to turn the CO2 back into any sort of fuel. It's far more efficient just to use that energy directly.
Same applies to turning CO2 into limestone: it takes energy, so you're better off using that energy directly.