Most emitted CO2 also remains in the carbon cycle.
What matters is accumulation at a particular point in the cycle because CO₂ is added to the atmosphere faster than it is removed. If it is removed faster then it ceases to be a problem.
I'm not sure what you're trying to say here.
It seems to me the first and last line don't really add anything and I don't see why the middle sentence is necessarily true.
What matters is accumulation at a particular point in the cycle because CO₂ is added to the atmosphere faster than it is removed. If it is removed faster then it ceases to be a problem.