While I agree with you on overpopulation, I would guess that the 17B number comes from 8B * 2.something years. Back of the envelope, it's odd that air pollutio

While I agree with you on overpopulation, I would guess that the 17B number comes from 8B * 2.something years. Back of the envelope, it's odd that air pollution is around 100x as bad as cigarettes (which admittedly not everyone smokes).