The term ecology is coined in German as Oekologie by Ernst Heinrich Philipp August Haeckel
The term smog is coined by Henry Antoine Des Voeux in a London meeting to express concern over air pollution
US Congress created the National Park Service
Rachel Carson published Silent Spring
The Apollo 8 picture of Earthrise
Earth Day – April 22., millions of people gather in the United States for the first Earth Day organized by Gaylord Nelson, former senator of Wisconsin, and Denis Hayes, Harvard graduate student. US Environmental Protection Agency established
Montreal Protocol on substances that deplete the ozone layer entered into force
The Kyoto Protocol was negotiated in Kyoto, Japan in December. Countries that ratify this protocol commit to reduce their emissions of carbon dioxide and five other greenhouse gases
U.S. rejects the Kyoto Protocol
U.S. announces it will cease participation in the Paris Agreement on climate change mitigation
U.S. announces it will rejoin the Paris Agreement on climate change mitigation