| gomezc said: You got that right. Once all of the easy-to-obtain oil is gathered up, all that's left is oil-shale. While there is a lot of it (especially in the US) it is by far the hardest to extract like you said. It would be nice if it was easy to get, since it would be an abundant alternative resource to be inplemented until we get used to renewable resources like wind, solar, etc.
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Extraction of oil from shale is terrible, even worse than oil sands. It returns less energy and uses extreme amounts of fresh water which is also a scarce resource vital for human survival. Wikipedia has a good article about it, with lots of references.
If there's a world war 3, I wouldn't be surprised if it's fought over oil, water or both. Increasing population and decreasing resources just can't end well. I'd love to be sure that we're taking enough steps to solve/mitigate the problem adequately, but I'm not.
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