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World Scientists' Warning to Humanity: A… duration 29 minutes 33 seconds World Scientists' Warning to Humanity: A… World Scientists' Warning to Humanity: A Second Notice	World Scientists' Warning to Humanity: A Second Notice Distinguished Professor Bill Ripple speaks to Corvallis High School, Earth Day Celebration, April 21, 2018 over population ozone layer depletion greenhouse gas effect fossil fuel pollution polar ice melting rising oceans From William Ripple 77 plays

duration 29 minutes 33 seconds

World Scientists' Warning to Humanity: A…

Distinguished Professor Bill Ripple speaks to Corvallis High School, Earth Day Celebration, April 21, 2018

From William Ripple 77 plays