The world's population hit 8 billion on Tuesday, according to UN projections. So, why should you care about this particular milestone? For one thing, population growth is slowing down, which means it'll take longer to reach 9 billion. That’s mainly a result of declining birth rates in Europe and East Asia. For another, 8 billion humans are now competing for increasingly scarce resources and territory in a planet already suffering the effects of climate change. Meanwhile, countries in sub-Saharan Africa are still having babies like there's no tomorrow — precisely where people have the least access to basic stuff like food, electricity, the internet, or water.
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