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Some materials are more replaceable than others. A pine wood fixture can be regrown relatively quickly. Even something like oak based furniture can be replaced in a few hundred years.

Heck, even plastic is pretty replaceable as reducing bio-material into plastic isn't unheard of. (The first plastics were made out of casein from milk).

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I get anxiety when I see helium balloons.

You can make plastic from air and light.

How?

Use lots of photovoltaic power (light) to sequester CO2 and H2O and jam it together into more complex carbon compounds? If trees can do it, we can at least approximate it (trees come from the air, not the ground).

A bio method will likely be a lot cheaper. Algae plastic would be three route to look at as you can grow a ton of algae very quickly. A little GMO and you could optimize it for CO2 sequestration.

Absurdly expensive though.

Depends on how literal/direct you are being. Algae plastic isn't terribly expensive to produce.

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