Humanity got a huge bill to be paid, and Mother Nature will still charge us. It’d be an awesome thing if humanity zeroed every single emission and pollution right today (better late than too late). But optimism is not compatible with the size of the climate bill accumulated over decades till today. A alcoholic can stop drinking today, but it won’t exempt them from the consequences of having been alcoholic. Sorry if I sound pessimistic, but our past as consumerist humans will still be haunting ourselves.