A tetrapod factory in Dongying, China. These concrete blocks are dropped into the ocean to create a barrier that protects low-lying oil refineries from rising sea levels. According to a recent scientific review, human beings have now produced enough concrete to cover the entire globe in a 2mm- thick layer.

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A tetrapod factory in Dongying, China. These concrete blocks are dropped into the ocean to create a barrier that protects low-lying oil refineries from rising sea levels. According to a recent scientific review, human beings have now produced enough concrete to cover the entire globe in a 2mm- thick layer