Population growth can be limited by density-dependent or density-independent factors. ... Geometric populations grow through pulsed reproduction (e.g., the annual reproduction of deer, ...

It took 200,000 years for Earth’s human population to reach 1 billion – and only 200 years to reach 7 billion. But growth has begun slowing as fertility rates decline.

Population growth in Nigeria is driven by a persistently high fertility rate, currently estimated at 4.8 births per woman, down from 5.3 in previous years.

As World’s Population Booms, Will Its Resources Be Enough for Us? New projections of escalating growth increase the tension between humanity’s expanding needs and what the planet can provide.