New York Startup Builds Fridge-Sized Machine That Can Turn Air Into Gasoline - Jalopnik
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While it's not quite the free energy it sounds like at first, Aircela's technology in its current state has some practical, small-scale applications.

The main reason why this process isn’t “something for nothing” is that it takes twice as much electrical energy to produce energy in the form of gasoline. As Aircela told The Autopian:

Aircela is targeting >50% end to end power efficiency. Since there is about 37kWh of energy in a gallon of gasoline we will require about 75kWh to make it. When we power our machines with standalone, off-grid, photovoltaic panels this will correspond to less than $1.50/gallon in energy cost.

Doesn’t it sort of defeat the purpose of gasoline being used because it’s so energy dense? Like, this seems to suggest little more than the benefits of electrification in transport.

  • MotoAsh@piefed.socialEnglish
    3·
    3 days ago

    I mean, removing CO2 from the air is not a bad thing at this stage of global warming. It shouldn’t harm any ecosystem short of like… somehow building gigawatt factories in the middle of the jungle, which would be its own environmental disaster. Removing water … ehh, would just have to locate a big plant somewhere that isn’t struggling for moisture.

    • MountingSuspicion@reddthat.com
      3·
      3 days ago

      Yeah, I was figuring similarly, but still. I’ve seen enough “harmless” “local” environmental changes spiral to know that at least some thought is warranted about it. I absolutely did not mean to suggest it would be harmful, just that I don’t know enough about it and would hope that somebody knowledgeable looks into it before they recommend scaling.

      • MotoAsh@piefed.socialEnglish
        1·
        3 days ago

        Oh absolutely. I would never feel comfortable about any such projects unless several and different scientific institutions signed off on it being low to zero (or hopefully positive) impact.