Let me make a square concession at the start: the pessimists are right when they say that, if the world continues as it is, it will end in disaster for all humanity. If all transport depends on oil, and oil runs out, then transport will cease. If agriculture continues to depend on irrigation and aquifers are depleted, then starvation will ensue. But notice the conditional: if. The world will not continue as it is. That is the whole point of human progress, the whole message of cultural evolution, the whole import of dynamic change – the whole thrust of this book. The real danger comes from
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