There is also the negative feedback of plants growing faster due to increased available CO2 for them to use.
It would be interesting to see the list of all feedbacks and estimated significance.
There's also the wildcard of algae evolution. Since there are quadrillions of them, evolution happens very quickly so changes in ocean acidification and temperature could substantially change how efficiently they work. They could get better or worse.
Do you have and references on your last point about algae? I have this (totally unsubstantiated) idea that plundering the oceans of fish along with rising temperatures will result in the oceans sequestering incredible amounts of CO2 via algae blooms. Never found much to read on the topic though - in what ways could this be negative feedback loop?
It would be interesting to see the list of all feedbacks and estimated significance.
There's also the wildcard of algae evolution. Since there are quadrillions of them, evolution happens very quickly so changes in ocean acidification and temperature could substantially change how efficiently they work. They could get better or worse.