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Global Catastrophes and Trends: The Next 50 Years Global Catastrophes and Trends: The Next 50 Years by Vaclav Smil
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“Stony objects with diameters 10 in are intercepted by the Earth's atmosphere every decade, and their entry (at speeds -20 km/s) discharges energy equivalent to about 100 kt TNT, roughly seven times the energy released by the Hiroshima bomb.”
The MIT Press, Global Catastrophes and Trends: The Next Fifty Years