 The prosecution says Baldwin acted negligently on the set. The world's population is expected to peak in the mid-2080s and then shrink by the end of the century. UN report leader Claire Menozzi says that expected peak is sooner and at a lower level than previously anticipated. The main reason is that all countries are having smaller families and longer lives. And as a result, the rapid population growth that started in the mid-20th century is now starting to slow down.