Climate change models seem to indicate amplifying feedback loops would be the likely scenario rather than "countering" forces. And for your specific example "i

Climate change models seem to indicate amplifying feedback loops would be the likely scenario rather than "countering" forces. And for your specific example "increased CO2 -> more plankton -> more fish", this tends to not be the case in reality. Large algae blooms result in mass fish die offs. And now combine that with the the presently-occurring Increased CO2 -> warmer temperatures -> warmer water -> less dissolved O2 -> dead fish