[Sofa King]

Yes, that's certainly all the science that one should need to back up the pertinent assertion

[snarks_when_bored]

I don't think there's any question that some of the oxygen produced by rain forests ultimately mixes into the atmosphere and spreads around the globe. Of course, you didn't say—nor did I—that "all" or "most" of the oxygen in the atmosphere is produced in rain forests.

Concision in non-scientific contexts is not a vice.