The world's population is expected to peak at 10.3 billion in 2084 and then decline to 10.2 billion through the end of the century.

Far more families are choosing to have fewer — or no — children. Many countries, including the U.S., now face a rapidly aging population that could begin to shrink.

* Over 8 billion people live on Earth today, with the next billion coming fast * Fertility rates are declining in 60+ countries, while Africa drives future growth * Urbanization, //aging, and climate ...