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Earth Day

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Earth Day
Wednesday, April 22

The first Earth Day on April 22, 1970, activated 20 million Americans from all walks of life and is widely credited with launching the modern environmental movement. The passage of the landmark Clean Air Act, Clean Water Act, Endangered Species Act and many other groundbreaking environmental laws soon followed. Growing out of the first Earth Day, Earth Day Network (EDN) works with over 22,000 partners in 192 countries to broaden, diversify and mobilize the environmental movement. More than 1 billion people now participate in Earth Day activities each year, making it the largest civic observance in the world.

There are many events going on this month all over the world.  
You can find campaigns to join here:  

Or observe the day in your own way by picking up trash at a local park or beach, or just deciding to stay home and have a day of using no fuel for transportation.

Later Event: April 22
Twilight at the Presidio