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The current rate of CO2 emissions is a major event in the recorded history of Earth. EPA
The "Earthrise" photograph that inspired the first Earth Day. NASA / Bill Anders
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Animal rights activists try to save dogs at a free market ahead of the Yulin Dog Eating Festival in Yulin city, south China's Guangxi Zhuang Autonomous Region on June 21, 2014. Jie Zhao / Corbis via Getty Images
The Great Barrier Reef, where record-high sea temperatures in February caused its most widespread coral bleaching event. JAYNE JENKINS / CORAL REEF IMAGE BANK
The first peer-reviewed research into a promising coronavirus vaccine was published Thursday. Javier Zayas Photography / Moment / Getty Images