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> Or, hear me out, devise a concrete that reacted with atmospheric co2 to produce something more benign. That way it changes from an emitter to being a passive remover

Good propertyy. It would be even better if the material acted as a good insulator. And be re- or upcyclabe when we need to tear down the building. And while we're at it: it would be nice if the product would just grow...

That sounds like a tree to me...




So true...




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