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You can still burry the soot after you burned the plastic.

Most of the carbon is going to end up as CO2 in the air, though.

You don't need to burn it in an open field ...

You can used a closed system so that the waste is actually all captured. Or you can have a more continuous system that'll capture/scrub the output.

Unless you capture it, as Amsterdam has been doing.

CO2 capture is a scam, perpetrated by the petroleum industry to make people think it's okay to burn more fossil fuels.