Zero population growth

Zero population growth, sometimes abbreviated ZPG, is a condition of demographic balance where the number of people in a specified population neither grows nor declines; that is, the number of births plus in-migrants equals the number of deaths plus out-migrants.^[1] The Zero Population Growth organization, founded by biologist Paul Ehrlich, induced a prominent political movement since the 1960s, aiming to reach zero population growth.^[2]

The movement considers zero population growth to be an objective towards which countries and the whole world should strive in the interests of accomplishing long-term optimal standards and conditions of living.^[3] It faces substantial support as well as criticism, involving different groups of people in society.^[2]

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