Purge them with COVID, Monkey Pox, Unnamed, yet to come pandemic. Inject the rest with "the cure" which will ultimately lead to being sterile... OR we could also find someway to piss off Russia and China so we can go to war with them and the purging can continue. Should be MILLIONS more dead. We should set the goal to 2 or 3 billion dead.
Of course the planet is going to enter an ice age shortly after the purge. No gas powered rides and way less people. WAY LESS HEAT on earth. Man, it's gonna blow. Frozen electric utopia full of the 1%