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shminux comments on Counterfactual resiliency test for non-causal models - Less Wrong
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I agree that some "limits" have proved illusory. But do you have an example where a limit based on conservation of matter or energy was surpassed?
I assume solar technology will continue to improve, but it would take several orders of magnitude of improvement for food-from-solar cells to be cost-competitive with cattle grazing low-value land. What does an acre of solar cells cost?
I mentioned some far-fetched stuff before, not that we need that much energy yet. There is plenty of energy around, just waiting to be harvested: solar, geothermal, fusion...