If you wait until the symptoms show, it’s too late to treat it and it’s almost certainly fatal.
That is a completely irrelevant argument to a population (and their children) that might already be dead from civil rights violations for 20 to 50 years at the time when climate change impacts are felt by the oppressive survivors.
If you accidentally consumed a fatal poison and had a very short time to counter it, in that moment would you give a crap about solving climate change? I won't believe you if you say "yes".