We can't really ignore Climate Change, as it is something that is currently occurring and unlikely to stop. Also, it is slowly but surely having disastrous effects on society at large.
It would only be catastrophic, not existential. We should work hard to reduce the risks and mitigate the impacts, but the species will go on even if we ignore it.
And, almost everything is getting better faster than anyone predicted. There's a strong case for climate optimism, and a future that we can improve by continuing to take action and put in the hard work of fixing the world.
The cold war was more serious and things worked out unexpectedly. World War I and II were more serious and they ended different than how everyone thought.
Landfills filling up was the concern now it's used for power generation. ACID rain.. holes Ozone layer. We fixed them.
Carbon in the air will be used to generate food as we find new ways to 3d print food. You will see. Our future problem will be not enough carbon