April 22, 1970: First Earth Day; 1915: First Use of Chlorine as a Terror Weapon

0422 Earth DayApril 22, 1970: The first nationwide Earth Day celebration is organized by Sen. Gaylord Nelson and Dennis Hayes. It creates a national political presence for environmental concerns. Millions of Americans demonstrate for air and water cleanup and preservation of nature.

April 22, 1915: The use of poison gas in World War I escalates when chlorine gas is released as a chemical weapon in the Second Battle of Ypres. Forevermore, chlorine is not considered a viable alternative disinfectant in Europe.

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