logistic equation: The mathematical expression for a particular sigmoid growth curve in which the percentage rate of increase decreases in linear fashion as the population size increases.

Major economies are heading toward a "population collapse" by 2100 because of falling fertility rates, new research ... will live in an economy with less growth while simultaneously having to ...

Such emissions from upper-middle-income countries have more than doubled since 2000, even though the population growth rate was falling throughout this period. Most high-income countries are ...