Dead trees keep surprisingly large amounts of carbon out of atmosphere

I still like: Grow plants/trees -> create plastics from them -> use plastics -> bury plastics forever

Otherwise plants/trees are just a type of carbon battery - pull carbon, burn for fuel, carbon goes back out, gets pulled back in again.

Do we need to grow plants to create plastics anyway? Wouldn't be better to just capture co2 and convert them to plastics (or other long lifespan products) directly