So you’re saying that at 1,000 meters I dont have to pay off my car or my mortgage?
And my wife can’t bother me anymore?
What’s the downside?
Nice table! Civilization would end (depending on where it hit) if the impactor were a mile in diameter, and possibly a good bit less than that. It would take a while, but by the time starvation would kill most of the human race, most of it would have died of thirst because the 100 percent global overcast would cause the hydrologic cycle to slow to zero within days or weeks. By contrast, the Chicxullub impactor was six miles in D, which was six times in three dimensions of a 1 mile object (216 times).
There's a few nice vids, collected from dashboard cameras and such, of the Chelyabinsk (see the keyword) bolide of 2013. That wasn't all that large, and it detonated at 26 km altitude, AND it wasn't in the most densely populated area on Earth by any means -- yet thousands were hurt.