this post was submitted on 16 Feb 2025
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Science Memes

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submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]
 
(page 4) 7 comments
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[–] [email protected] 51 points 2 months ago (4 children)

There are plenty of arguments to be made against direct air capture, but entropy isn't one of them. Nobody ever claimed this is some kind of perpetuum mobile.

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[–] [email protected] 38 points 2 months ago* (last edited 2 months ago) (22 children)

The point is to use a low carbon power source to power it.

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[–] [email protected] 7 points 2 months ago (4 children)

That's essentially how many gases are made from mixtures, like notrogen or oxygen. Showing this as something new tells a lot about author's uderstanding. Carbon capture is not about making entirely new tech, it's optimization, and that's where startups suck at everything except for getting and then wasting cash.

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[–] [email protected] 56 points 2 months ago (4 children)

That small red bulb counteracts the entropy argument because you bring energy (and quite a lot of I recall) into the system.

Would be a sad day if we no longer could reduce entropy locally under the invest of energy.

[–] [email protected] 13 points 2 months ago* (last edited 2 months ago) (1 children)

The wider issue is you have to generate that energy, and you have to be able to capture more carbon than that generation released.

As I understand it doesn't at all. This is why it's seen as analagous to a perpetual motion machine, it's an endless chain of power plants capturing each others carbon to no end.

You could use solar of course, but then why generate anything with fossil fuels just to capture the carbon with solar? Just use solar.

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[–] [email protected] 29 points 2 months ago (1 children)

Would be a sad day if we no longer could reduce entropy locally under the invest of energy.

I don't think there'd be anyone left alive to be sad in that case...

[–] [email protected] 14 points 2 months ago
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