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Supertopics:
Deforestation 2010 through 2016

half of trees (so far) are gone since human civilization      web

webhttps://www.alternet.org/2015/09/earth-has-lost-half-its-trees-dawn-civilization/
doc-titleEarth Has Lost Half of Its Trees Since Dawn of Civilization
authorTim Radford
publicationClimate News Network
date2015-09-04

Documents:
mapping tree density on a global scale
webT. W. Crowther, H. B. GlickNature2015-09-02
trees are essential in many ways, and are half gone
webTim RadfordClimate News Network2015-09-04

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