El propio autor recomienda una variante muy parecida a lo que yo proponía y está estudiando implementarla en una futura expansión.
"At the end of each generation, the current first player chooses 1 global parameter (ocean/oxygen/temp) that will be increased. This happens before the new generation begins and before player order shifts.
The first player does not get any TR or placements bonuses when doing this, and any bonus steps on the tracks are ignored.
This rule speeds up the game a little. The choice of parameter to increase, or placing an ocean, also gives a small extra tactical element - even without the rewards."
https://boardgamegeek.com/thread/1737666/are-there-any-variants-official-or-not-shorten-gam
"At the end of each generation, the current first player chooses 1 global parameter (ocean/oxygen/temp) that will be increased. This happens before the new generation begins and before player order shifts.
The first player does not get any TR or placements bonuses when doing this, and any bonus steps on the tracks are ignored.
This rule speeds up the game a little. The choice of parameter to increase, or placing an ocean, also gives a small extra tactical element - even without the rewards."
https://boardgamegeek.com/thread/1737666/are-there-any-variants-official-or-not-shorten-gam