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The counter to "dozens of kids" is that pregnancy and childbirth are physically taxing for women. Most people of reproductive age want sexual relationships. Many people want children. Very few women want to give birth to 12+ kids. Even the wives of billionaires don't have that many children, despite having more than enough material resources to support them. (Elon Musk's 12+ children required several women.)
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Replace dozens of kids with any piece of wanton consumption then. How is it checked? Hoping we get bored of orgies and parties and feasting and this is enough to ensure we can reproduce indefinitely and continue to orgy and party and feast? I don't think so. At the end of the day, the world cannot sustain everyone living with the carbon footprint of a wealthy person living life to excess. It can't even sustain the carbon footprint of everyone living how they currently live.
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