The amount of manmade goods around today is 30 trillion metric tonnes. That’s about 50 kilogrammes for every square metre of Earth’s surface. Researchers refer to this tsunami of stuff as the ‘technosphere’. The term is a way of helping people recognizes the magnitude and pervasive influence of humans on the planet. In Earth’s biological ecosystems, animal and plant waste are generally reused by other organisms in an efficient cycle of life. Much of the material in the technosphere, by contrast, ends up in landfills where it often doesn’t decay or get reused.
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