[planck01]

You can also turn co2 into trees. More lowtech, but more useful than coal that's created with energy that should be buried as nobody will do that (next to the others usages mentioned which are mostly consumables and hardly viable co2 sinks).

[benekastah]

Unfortunately trees can't reclaim co2 at the rate we release it though. Seems like supplementing that strategy with novel solutions like this makes sense.