Population - 8 Billion People
There are now eight billion humans on the planet. A baby born somewhere on Tuesday will be the world's eight billionth person, according to a projection by the United Nations. The UN attributes the growth to human development, with people living longer thanks to improvements in public health, nutrition, personal hygiene and medicine. It is also the result of higher fertility rates, particularly in the world's poorest countries -- most of which are in sub-Saharan Africa -- putting their development goals at risk.
Population growth has also magnified the environmental impacts of economic development. But while some worry that eight billion humans is too many for planet Earth, most experts say the bigger problem is the overconsumption of resources by the wealthiest people.
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