Earlier quoted context omitted.
I don’t think any of these are really that critical: they will become a problem in a few centuries if we do absolutely nothing but will likely be fine. Take ocean deoxygenation: it happens locally due to fertiliser runoff in places that have a history of low oxygen. It’s good to put some resources towards fixing this, but it’s not useful to think of it as an extinction level problem that we “now have.”
Wow, you have the entirety of the world ecosystem, from deep ocean currents and biology, to the entire 70% of the world's surface oceans, to the jungle rainforests, arctic/antarctic ice, atmospheric changes, solar radiation variation, historical records, 100% accurate computer simulations/predictors, all nailed down? All the interaction of species, effects of (mass) extinctions? Invasive species? Habitat destruction,…
Just a few things you get wrong: thinking models are 100% accurate, thinking scientists have everything “nailed down” and assuming that I don’t know enough to back up my opinion.