A tradition that started as a US grass-roots movement in 1970 and now, since 1990, has become an official worldwide celebration of environmentalism on April 22 each year: http://www.earthday.org/
Historians trace that public consciousness to Rachel Carson's bestseller Silent Spring (1962), which raised awareness about the planet as a living organism. One more example (our discussion yesterday!) of how a few small voices can gather up into a roar for change.
Happy Earth Day!
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