We humans are like the plague and every unborn child is the best contribution to saving the Earth.
The Earth as a flat disc, yes. But let us imagine the Earth for just a moment as a sphere, then one (hopefully) recognizes the naive calculation: every unborn child also "produces" unborn environmentally conscious grandchildren, who therefore also cannot save the world.
Under-youthfulness leads to aging, not to saving the world. Every unborn child results in the remaining children having to become caregivers for the elderly.
My brother and I (and in the same house, born 1903, also my childhood friend and his sister) romped on roll carpets on wooden floors. The plaster has meanwhile aged four decades and still holds. Although we were even raised "anti-authoritarian" back then. Maybe back then people simply paid more attention when training construction workers.