• Owl@mander.xyz
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      24 minutes ago

      Algae in water doesn’t burn like trees

      Checkmate commies !

  • Chaotic Entropy@feddit.uk
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    3 hours ago

    It sounded cool a couple of years ago, but it was first installed in 2021 and I’m yet to hear of it really going anywhere.

  • xor@lemmy.dbzer0.com
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    8 hours ago

    homeless people find sitting in the shade of trees to be comfortable, and the city whole point of urban design is to make them uncomfortable and to suffer

  • Günther Unlustig 🍄@slrpnk.net
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    9 hours ago

    Does this count too?

    I already posted this on !balconygardening@slrpnk.net. .

    I’m purposefully growing duckweed on my balcony.
    I’m doing !hydroponics@slrpnk.net, and by doing that, I have lots of waste water with still good fertilizer in it.

    Duckweed is one of the fastest growing, nutrient densest and least demanding plant out there, and you can just scoop it out with a strainer.

    It’s exponentially growing and if you don’t wanna eat it, it makes great organic fertiliser or animal feed with lots of protein and micronutients!

  • Daniel Quinn@lemmy.ca
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    15 hours ago

    I had the same reaction until I read this.

    TL;DR: it’s 10-50x more efficient at cleaning the air and actually generates both electricity and fertiliser.

    Yes, it would be better to just get rid of all the cars generating the pollution in the first place and putting in some more trees, but there are clear advantages to this.

    • lightnsfw@reddthat.com
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      1 hour ago

      How long does it take to break even from the pollution and electricity spent to make and install these?

    • A_norny_mousse@feddit.org
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      13 hours ago

      I appreciate Rebecca Watson’s opinion. Watched the 6min video, now convinced 👍

      Also learned a new term: kneejerk cynicism

    • FarceOfWill@infosec.pub
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      13 hours ago

      It provides fertilizer but needs “some food”.

      How much food and what is it?

      Typically for aquariums you have to feed these things fertilizer so it seems odd

      • rumba@lemmy.zip
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        34 minutes ago

        It’s just some circle of life stuff, fertilizer, carbon dioxide, light in, The algae produces more algae. It loads up on a bunch of carbon, some of the bloom dies off, by removing it, you take the carbon with it along with some of the fertilizer components. You add a little more fertilizer in and the algae blooms more and sucks up more carbon dioxide.

  • 0ops@lemm.ee
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    9 hours ago

    It’s not an either/or thing, the tank in the picture is literally sitting under a tree

      • tal@lemmy.today
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        16 hours ago

        Just give me a 4U tank somewhere where someone else can deal with harvesting the algae and a webcam aimed at it and I can enjoy it just fine from here. For me, selfhosting is mostly about the privacy, not principally about needing to be resistant to loss of Internet connectivity or the like.

    • DUMBASS@leminal.space
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      17 hours ago

      Come on, you know there’s someone out there trying to work out how to selfhost one of these.

        • _stranger_@lemmy.world
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          16 hours ago

          You should look up “Walstad planted tank”. An all plants aquarium you don’t ever have to mess with (except to trim if you want to)

          • SolarMonkey@slrpnk.net
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            2 hours ago

            I’ve been doing these for years… they don’t work as intended for more than a year or two, and then become pretty unstable. Even the lady who created it went back to low-maintenance (as opposed to zero input) systems after a few years. Still with the dirt and all but not without water movement and stuff.

            • _stranger_@lemmy.world
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              1 hour ago

              Awesome! yeah, there’s a variant where you can seal the jar, but for the most part exactly what you said is the norm. I’ve had mine for roughly 5 years now, but I added shrimp and trim it back about once a month or so . I don’t even feed the tank more than a few times a week.

  • Allero@lemmy.today
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    15 hours ago
    1. Wrong community, maybe? Lol

    2. iirc, algae are better oxygen producers per units of mass and volume, so a tank full of algae might actually be better than a tree. One issue though is that trees can grow on open ground, while algae require a tank to be built, most likely negating the economic benefits. Also, trees are more aesthetically pleasing.

    • superkret@feddit.org
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      16 hours ago

      I love this about lemmy.
      Like someone stumbling into the wrong house and still being welcomed.
      It’s a lot more informal and relaxed than on the piss page of the Internet.

  • Psychadelligoat@lemmy.dbzer0.com
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    19 hours ago

    Because there’s no serious answers being given even though there are at least 2:

    • trees have roots, roots ruin any nearby human infrastructure. You’ll note this says “in urban environments” and that there are trees nearby, so this is probably the big reason
    • trees need maintenance, which costs money. this is a stupid reason imo, but it’s one nonetheless
    • algae is cool, ok?
    • zeca@lemmy.eco.br
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      19 hours ago

      trees dont ruin ANY human infrastructure. But the usual urban infrastructure isnt well thought out enough to exist around trees. But smarter urbanism is possible and in fact does exist.

      • Psychadelligoat@lemmy.dbzer0.com
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        19 hours ago

        trees dont ruin ANY human infrastructure

        I think you mean all, as this reads more like “nuh uh, trees don’t ruin anything”

        But smarter urbanism is possible and in fact does exist.

        And those are not the norm, so for places that don’t plan to just destroy what’s already there and start anew, this is an option

      • halcyoncmdr@lemmy.world
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        17 hours ago

        Not just more efficient, vastly more efficient. Algae is 10-50 times faster at processing CO² than trees are. Some algae can be up to 400x as efficient.

        It’s just not as “nice” to look at, we usually associate algae with growth in unsafe bodies of water like bogs, etc. versus a nice clean pool or even a maintained pond.

    • Dremor@lemmy.world
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      18 hours ago

      On the other hand, algae do not produce shade, not sure if it filters atmospheric pollutants, and trees provide all sort of other services to the local ecosystem.

      Maybe this invention can be used on places where trees cannot lives, but I’d still take a city with trees over a city full of green tanks.

    • ohwhatfollyisman@lemmy.world
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      18 hours ago

      “let’s uproot all these trees and invade this space. and when the roots of the few remaining trees do what they are supposed to do, let’s blame them for ‘ruining’ human infrastructure!”

      • Chaotic Entropy@feddit.uk
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        3 hours ago

        Every 6 months half of it gets removed, to use as fertiliser, and it is refilled with tap water and some feed.

  • 21Cabbage@lemmynsfw.com
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    16 hours ago

    Practical answer, fits in places trees may not. Pessimistic answer, fits in some guys cyberpunk ass vision for what he wants his office block to look like.

      • jagged_circle@feddit.nl
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        8 hours ago

        This technique is controversial because there is limited understanding of its complete effects on the marine ecosystem,[5] including side effects and possibly large deviations from expected behavior. Such effects potentially include release of nitrogen oxides,[6] and disruption of the ocean’s nutrient balance.[1] Controversy remains over the effectiveness of atmospheric CO2 sequestration and ecological effects.

        Geoengineering is bullshit proposed by funding from fossil fuel companies so they can continue to pollute.

        The solution is simple: make it illegal to pollute. Fine the companies responsible for their past contributions to the climate catastrophe out of existence.