[booi]

Previous commenter said if the loss accelerates. Larger and larger changes each year would be more than worrisome.

[ljf]

I agree, we should consider that further oxygen loss could come from long burning wild fires etc, should the environment lend itself to a higher propensity to them. This could both burn oxygen and remove plants that would therefore not create and replace oxygen (in the short terms at least).

I am sure there are some weird feedback loops we are going to see in the next century or two, that aren't yet considered an issue.

[roenxi]

We're quite likely to start running out of fossil fuels in the next few decades. It is unlikely that the loss will accelerate.

[engineer_22]

To play devil's advocate: Nothing suggests the trend will accelerate. It is just as likely to decelerate.