The Planetary Defense Conference gathers to discuss how one would go about deflecting the orbit of an incoming asteroid.
Meanwhile, the train wreck of global warming and mass extinction unfolds in slow motion before our eyes, too slowly to really jolt us into action.
We didn't evolve to deal with such slow threats.
What's going to happen is that those of us who can afford the luxury will gradually adapt to an increasingly barren Earth, and we'll consider that the new normal.