All we have to to replicate Chicxulub is build a million copies of a bomb we've made before? The iPhone might be harder to make than a bomb, and we've made 200 million of those.
Probably easier option is just redirecting an asteroid bigger than Chicxulub impactor. But the point is that even that is not enough to eradicate life.
As I said, you would need something like Late Heavy Bombardment or Venus like greenhouse effect and even that may not be enough.
Based on the Moon craters Late Heavy Bombardment would include:
- 22,000 or more impact craters with diameters >20 km (12 mi),
- about 40 impact basins with diameters about 1,000 km (620 mi),
- several impact basins with diameters about 5,000 km (3,100 mi)
It's also important to highlight that everywhere were our ancestors appeared soon after megafauna population got reduced by 20% - 70%:
If I'm reading this right, it took evolution about 3.5 billion years to get animals, and there's only 1.3 billion years left until it's too hot for eukaryotes.
As I said, you would need something like Late Heavy Bombardment or Venus like greenhouse effect and even that may not be enough.
Based on the Moon craters Late Heavy Bombardment would include:
- 22,000 or more impact craters with diameters >20 km (12 mi),
- about 40 impact basins with diameters about 1,000 km (620 mi),
- several impact basins with diameters about 5,000 km (3,100 mi)
It's also important to highlight that everywhere were our ancestors appeared soon after megafauna population got reduced by 20% - 70%:
https://en.wikipedia.org/wiki/Holocene_extinction#/media/Fil...
In the last 100 years we just entered path to near total eradication of megafauna. E.g. wild mammals account now for ~4% of mammals biomass.
Complex life is nowhere near as robust as simple life forms.