Making fewer babies: the demographic decline

The world's population may have shot up beyond eight billion for the first time recently, but some countries including the most populous, China, are seeing their populations shrink.

How the last 12,000 years have shaped what humans are today

While humans have been evolving for millions of years, the past 12,000 years have been among the most dynamic and impactful for the way we live today, according to an anthropologist who organized a special journal feature ...

Should we build a nature reserve on Mars?

There are 8 billion of us now. The UN says when the population peaks around the year 2100, there'll be 11 billion human souls. Our population growth is colliding with the natural world on a greater scale than ever, and we're ...

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