I agree with sendler's general idea that we need to transition away from dwindling resources prior to "running out", but I foresee a more gradual letdown in resources. After all, we saw what happens when fuel prices are very high; we start cranking out the fracking sources domestically.
So it will go, as scarcity sets in, the more difficult to produce sources of fuel will be tapped. This will cause a gradual rise in prices that will spur further incentive to utilize alternative means of energy. It's not like 40 years of abundance and then the light switch is flipped off.
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