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This holistic view has helped slow the increase in world population.
The average family has declined from six children in 1960 to around three today.
The world's population is expected to grow by 39% over the next 45 years and births in the 50 poorest nations are estimated to rise by 228%.
The key obstacles are religious, cultural, and political opposition to contraception or the possibility of population decline.
Since 1994 more women have access to education and other rights, and more early-marriage traditions are being opposed.
Most countries have laws prohibiting violence against women, female genital mutilation, and other violations of human rights.
We have 18 families and no one has more than three children.
The health of the children and mothers has improved, and so has the spacing of babies.
We are far from a world in which all births result from intended pregnancies.