• illi@lemm.ee
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      2 hours ago

      These have to take up more space than a tree…

      • Sylvartas@lemmy.dbzer0.com
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        2 hours ago

        I think the idea behind this is that algae are more space-efficient than trees at producing oxygen and/or capturing CO2. Of course this is also ignoring that the bulk of a tree’s volume is high above the ground, and they also provide other things like shade and shelter for insects etc.

      • jmcs@discuss.tchncs.de
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        6 hours ago

        When this was proposed the idea was that one of tank can replace two trees and it can be put in corners that are too small for trees (and cars). When you consider the space for roots you can get at least one parking space per tank at the cost of making car-centric cities even more of an hell hole.

        • illi@lemm.ee
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          1 hour ago

          Ok I can see that space wise. Have fun having an enormous concrete oven though