2 ms·Burning it as fuel would put it back. It would become a closed cycle.by jjoonathan 4y agoBurning it as fuel would put it back. It would become a closed cycle.criddell 4y agoThe ones used for plastics, lubricants, fertilizers, etc... wouldn't be returned so quickly.affgrff 4y agoOr it will be stored/hoarded underground again.