The fun thing is, we cannot recognise this kind of danger. Our regular animalistic detection mechanism cannot be triggered by this, so we're kind of aware but nothing in us tells us to get away from the problem. Even as you write this, you probably don't truly believe that this could very well be the end. For once the slowly boiled frog thing is actually true.
over 20 years I completely recognized a warming, and I'm doing my best (no car, minimal consumption/spending, CO2eq footprint about 5% of average person in Western Europe), not many people are doing this, but there are plently benefits, not just environmental
It seems a bit like dying of a radiation overdose - a lethal exposure can take just moments, and you will go on as though nothing happened for a time, but the damage is done and irreversible.