Could we harness these mechanisms to keep the earth compatible with human habitation?
As I recall, there is a group of creatures that may did the first big wave of carbon fixation at the beginning of life, binding CO2 and releasing the important O2 that enabled the appearance of complex life forms, but I can't remember it's name.
You'd expect to see this effect most prominently in continental rain shadow areas, particularly at altitude.
Frankly, the outcome is unknowable, there are too many variables, both known and unknown. The only element which does seem inevitable is that there will be major changes to human civilisation.
Oh - one thought I did have was blanketing the Arctic in artificial icebergs - just big white floating plastic platforms, millions of them.