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Philadelphia
Philadelphia committee led by Benjamin Franklin attempts to regulate waste disposal and water pollution. -
Henry Thoreau
Henry David Thoreau publishes Walden -
Ernst Heinrich
The term ecology is coined in German as Oekologie by Ernst Heinrich Philipp August Haeckel -
Robert Angus Smith
The term acid rain is coined by Robert Angus Smith in the book Air and Rain -
Henry Antoine
The term smog is coined by Henry Antoine Des Voeux in a London meeting to express concern over air pollution -
National Park Service
US Congress created the National Park Service -
Sputnik 1
First Artificial Earth Satellite launched by the U.S.S.R -
Laika
First Dog/ Animal Launched Into Space -
Luna 2
First Spacecraft To Hard-land On Another Celestial Object ( The Moon ) -
Luna 3
First Pictures Of The Far Side Of The Moon -
TIROS 1
First Applications Satellite Launched ( Weather Scanner ) -
Yury Gagarin
First Human To Orbit Earth -
Rachel Carson
Rachel Carson publishes Silent Spring -
Mariner 2
First Data Returned From Another Planet ( Venus ) -
Valentina Tereshkova
First Woman In Space -
Aleksey Leonov
First Space Walk -
Mariner 4
First Spacecraft Pictures Of Mars -
Earthrise
The Apollo 8 picture of Earthrise -
First Earth Day
First Earth Day – April 22. Millions of people gather in the United States for the first Earth Day. US Environmental Protection Agency established -
Montreal Protocol
Montreal Protocol on substances that deplete the ozone layer entered into force -
Kyoto Protocol
The Kyoto Protocol was negotiated in Kyoto, Japan in December. Countries commit to reduce their emissions of carbon dioxide -
Rejected Kyoto Protocol
U.S. rejects the Kyoto Protocol -
Paris Agreement
U.S. announces it will cease participation in the Paris Agreement on climate change mitigation -
Rejoined Paris Agreement
U.S. announces it will rejoin the Paris Agreement on climate change mitigation