There are *so many* technologies for pulling CO2 from the air. At least some of these will scale and be profitable, and we've barely even started working on the problem, so the sky's the limit. Here's a new one:https://youtu.be/ejW4f6liOS8?t=4497 …
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So although everyone has their ridiculous nonsense ideas, the truth is, unless you decide that humanity is going to implement population control, our future is space travel and technology. Lifestyle modification as an idea is just a failure to understand exponentiation.
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The fertility rate of most developed countries is below 2 births per woman and has been for decades. If it weren't for immigration, population would shrink. "Population control" is improving health and education. Let Hans Rosling explain.https://youtu.be/BkSO9pOVpRM
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Wasn’t it debunked that humans will endlessly increase in numbers? Last I’ve read we’re supposed to plateau at around 11 billion. Just as people’s reproductive rate will dwindle down to around 2 children per pair?
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It does matter if you deplete all your resources before you'll be able to make other planets habitable. I don't think making Mars habitable is a matter of a few decades.
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I think the endgame you describe is a bit of a straw man version of what I feel is needed for society to survive. If tech proves to be sufficient alone, we need to buy time with lifestyle changes to reduce risk of civilization collapse. There's no guarantee tech alone is enough.
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Tech++ = higher supply of energy/food/logistics etc. Lifestyle changes = lower demand. If we keep increasing society-wide demand, we're just making it harder for tech to succeed. Which is why I can't see why striving to ALSO reduce demand (by say 10-20%, not completely) is bad.
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