Girl Planting seeds

Thinning ozone layer may have driven Earth's largest mass extinction 252 million years ago

The effect of high UV on conifers and potentially other trees suggests caution today in introducing chemicals that deplete Earth's ozone layer, which has yet to recover after a global ban on chlorofluorocarbon refrigerants in the 1980s instituted after ozone holes developed over the poles. Some industrial chemicals also destroy atmospheric ozone, which is the planet's sunscreen, protecting all life from excessive UV rays, in particular UV-B wavelengths, which causes mutations in DNA.  Read more...



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