Manfred Laubichler

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Population growth fuels knowledge, leading to new technology and energy use, fueling more population growth. Robert Essel/The Image Bank via Getty Images

8 billion humans: How population growth and climate change are connected as the ‘Anthropocene engine’ transforms the planet

Manfred Laubichler, Arizona State University

The UN estimates the global population will pass 8 billion people on Nov. 15, 2022. From the Stone Age to today, here’s how things spiraled out of control.