The BBC More or Less podcast did an investigation on this and found no actual evidence for the claim. It seems to be based on a study on roundabouts in one town in england and then people just assumed that all world soil was suffering the same rough treatment...
This piece is just a reprint of a speech made by a UN official. No science quoted.
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[ 1.7 ms ] story [ 16.2 ms ] threadThis piece is just a reprint of a speech made by a UN official. No science quoted.
https://www.bbc.co.uk/programmes/p08dx986