I am not sure the science is so clear about that. I think there is a max capacity of C02 the planet can have in it's atmosphere. If that capactiy is reached, the planet will heat up faster and faster. But if we suddenly stopped most C02 emissions and planted billions of highly effective C02 storing trees and/or algae reserves, we would never reach that threshold.
I know this will never happen, but if China, Russia, India and America actually agreed on this, I think we could stop it from happening, at least for the next 500 years.