crazy_eoj also raises an interesting point. It's an inevitability that sustainable, renewable energy sources will eventually become more economical than fossil fuels. Once technology reaches that level, our oil and gas reserves become essentially worthless, so it's prudent to maximize our ROI before then. The trick is knowing when renewable sources will surpass fossil fuels in efficiency, though and ensuring we've "tapped out" by then. Will it be 25 years from now? 50? Within our lifetimes? Centuries in the future? I doubt anyone can make an accurate prediction with any degree of authority.
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