Revision history of "Thresholds of environmental sustainablility"
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- 12:51, 2 December 2020 Dronkers J (talk | contribs) deleted page Thresholds of environmental sustainablility (content was: "==What are ecological thresholds?== '''Ecological thresholds'''[http://en.wikipedia.org/wiki/Ecological_threshold] have been defin...", and the only contributor was "Zelealem" (talk))