Here's a thought from Max Roser's Our World in Data. Infant mortality has declined dramatically since 1950. He points out that no country today has a child mortality rate as high as Portugal had in 1950. Furthermore, Portugal now manages a child mortality rate 40% lower than we do in New Zealand, and has sustained that for several years. Maybe we could learn something.
I've also included Papua New Guinea for context. Just in case you thought this was all about technology and that, maybe, government policy did not matter - click on add countries at the bottom left of the chart and add Cambodia for a dramatic example.
Of course, if you don't like being happy - you can focus on the huge problems facing the world and confront the sobering reality of what's required to avert death by overheating the planet.