Climate engineering won't help (there is a million of unsolved and unsolvable issues with it). We have to stop emitting CO2 (etc), there is no other way. Why?

Climate engineering won't help (there is a million of unsolved and unsolvable issues with it). We have to stop emitting CO2 (etc), there is no other way. Why? Because if the warming won't kill us, ocean acidification will, and that is directly connected to the C in CO2.