>Fertility, mortality, migration, and population scenarios for 195 countries and territories from 2017 to 2100

tl;dr: the world's population might go into decline from now until 2100. Can't tell if that's a good or bad thing, though.
Summary
Background
Understanding potential patterns in future population levels is crucial for anticipating and planning for changing age structures, resource and health-care needs, and environmental and economic landscapes. Future fertility patterns are a key input to estimation of future population size, but they are surrounded by substantial uncertainty and diverging methodologies of estimation and forecasting, leading to important differences in global population projections. Changing population size and age structure might have profound economic, social, and geopolitical impacts in many countries. In this study, we developed novel methods for forecasting mortality, fertility, migration, and population. We also assessed potential economic and geopolitical effects of future demographic shifts.
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)30677-2/fulltext

Can't tell if this is a good or bad, though.