"But we can't start killing billions of people."
Of course we can't.
The suggestion could be a desperate recognition of the seriousness of the problems we are facing.
It could be a trial to divert from the question of growth.
The "killing" suggestion can be answered with serious proposals of planned reduction of resource use, following a general halt to the growth policies.
World population was estimated at
The world population is still rising:
as we wrote this page.