No, you're far from the only one. While what makes for a materially content life varies a lot according to your outlook, it's generally so that it takes a lot to make us happy. When then we have gone from being relatively rare, like other large, demanding, long-lived, top-of-the-food-chain creatures to having a population on the order of that of the brown rat... I worry about its wisdom or sustainability.

We're going to need to reformulate economic and social policies in such a way as to support a declining population because this always more people model I cannot see lasting.

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'It depends on which research report you read,'says Hattie, 'and sorry about this, but I do tend to believe the ones that suit me.'