The problem is that yes, historically humanity has learned (at least temporarily) when it induced a crisis.
The big difference between climate change and other catastrophies like the world wars is that it’s irreversible. We can rebuild cities, countries even within few generations. We absolutely cannot rebuild earth after we fucked up the climate.
Even if we learn from this it will be too late to apply the learnings. This one isn’t a case of “fucking around and finding out”.