Plan B, you will remember, is that we relatively rapidly reduce our population, our activity, our production and our consumption to a level that can be supported with renewable energy alone. The last time we did this was some time in the seventeenth century, when there were less than a billion humans on Earth. I leave it to the reader’s imagination as to how quickly we might make such a transition. But I also ask readers to note that while Plan B is extremely unpalatable; Plan A doesn’t actually exist.
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