The amount of oil left, the food-growing capacity of the world’s farmland, even the regenerative capacity of the biosphere – these are not fixed numbers; they are dynamic variables produced by a constant negotiation between human ingenuity and natural constraints. Embracing dynamism means opening your mind to the possibility of posterity making a better world rather than preventing a worse one. We now know, as we did not in the 1960s, that more than six billion people can live upon the planet in improving health, food security and life expectancy and that this is compatible with cleaner air,
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