What is the best way to destroy the world?

What is the best way to destroy the world?

If you wanted human civilization to crash and never recover, what mechanism would be your best bet?

Leave them to their own devices? :^D

nukes

doomsday machine

Pandemic

multiculturalism

boil so much ocean water that the atmosphere becomes too pressurized.

Wait.

socialism, global nuclear war, there are several possibilities

the good thing is you dont have to kill all humans or anything. you only need technological regression

too many of the easily accessible ressources have been exhausted. we have no second chance, we can only move forward

Create a lethal strain of small pox that has a 95% mortality rate. Then give free vaccinations to every body on earth using a modified cow pox vaccine that gives them a 100% sterility rate.