100 Wasn't it formaldehyde that went missing from that train weeks ago? (twitter.com) posted 1 year ago by CanadianPedeMan1571 1 year ago by CanadianPedeMan1571 +101 / -1 30 comments share 30 comments share save hide report block hide replies
As a breakdown product of something else, like burning plastic. Not exactly "natural," though.
Formaldehyde is an organic compound and is released naturally in many ways, including forest fires. Although it’s certainly not safe to be around in high levels.
This should be the top comment.
Yes, I meant burning plastic isn't natural. Most natural ways wouldn't be overwhelmingly obvious.