There are so often scary headlines talking about aging populations and declining birth rates. For example: https://www.politico.eu/article/italy-birth-rates-coronavirus-pandemic/

This is actually good news on a number of fronts: people can freely choose children or not; the #climate needs fewer people living high-impact, developed-world lifestyles; and historically, shrinking populations give more power to the masses. Productivity is still growing, so the economies will be fine. For a real world example, see Japan's declining population.