Something about equating the choice to have kids with reducing the climate impact leaves me with an icky feeling. Not all humans have the same climate impact, so not all children would, either. Instead of telling Bob not to procreate, we really need to take a long hard look at Bezos and his many private flights.
Never forget that "carbon footprint" is propoganda by the fossil fuel industry to push the responsibility of climate change onto individuals rather than large corporations who are the ones truly responsible for the mess we're in.