Concrete accounts for around half of all human-made things. And if its rate of growth continues, it will overtake the total weight of Earth's biomass sometime around 2040. Try to picture that in the mind's eye: there is a day approaching soon when there will be a greater weight of concrete on Earth than every single tree in every forest, every fish in every sea, every farm animal in every field, and every person breathing, walking, living right now. Many thanks to Richard Fisher and Javier Hirschfeld.
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