Yeah, OWID is great, as is Hans Rosling's work (mentioned below) concerning human welfare improvement. The past definitely sucked a lot. My main concern with overpopulation is that we may have already exceeded the sustainable carrying capacity of the planet, which can have disastrous consequences for all. Soil and fresh water availability spring to mind as ever pressing issues resulting from unsustainable practices in many parts of the world. Climate change is sure to stress agriculture further. Dietary changes and technology will surely help but judging from how reactive we appear to be as species, I don't have high hopes.

https://worldpopulationhistory.org/carrying-capacity/