I am the wurst!
In solo mode, do the neutral greenery tiles placed (adjacent to the cities) during set-up raise the oxygen % level?
On one hand, the O2 symbol printed on the greenery would suggest yes. But it also makes the game that much easier to beat, specifically by 2 oxygen steps.
Thanks in advance.
No they do not - bold added by me for emphasis.
"1) Before you choose your cards, place 2 neutral city tiles
on the map with an adjacent greenery tile each (these tiles
are not yours, and do not increase the oxygen level):"