Broken Ozone Layer Caused End Devonian Mass Extinction
A correspondent brought THIS ARTICLE to my attention. It reports on field work in Greenland and Bolivia by scientists from Southampton University School of Ocean and Earth Science.
They looked at spores and discovered that they were malformed, indicating damage by ultra-violet radiation. Today the ozone layer protects us from such radiation and they surmise that today's conditions are similar those of the late Devonian. A similar collapse of the ozone layer could have deadly consequences.
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