In 1890 perhaps 200 million people lived in cities worldwide, but by 2000 the figure had leapt to three billion,

In 1890 perhaps 200 million people lived in cities worldwide, but by 2000 the figure had leapt to three billion, half of the human population.
Steffen, Crutzen, McNeill 2007 classic Anthropocene essay.
@OurWorldInData
ourworldindata.org/urbanization
One for @SoberLook https://t.co/56Qz3yf2Vq

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