…the two billion poorest people on the planet still lack access to basics like toilets, housing, food, health care, education, and so on. This means that fully one-quarter of humanity … is immiserated in ways that the poorest people of the feudal era of the Upper Paleolithic were not.
— The Ministry for the Future by Kim Stanley Robinson (13%)
The future that I'm worried about is the one where, instead of everyone zooming about in photoelectric kite yachts, this proportion of people living in worse-than-Upper-Paleolithic conditions increases, gradually or quickly, to all of humanity.