20 million Americans mobilized on April 22, 1970; 30 years later, that number was up to 200 million citizens of the Earth. What was the cause that brought these people together? The desire to make the Earth a better place. Earth...

20 million Americans mobilized on April 22, 1970; 30 years later, that number was up to 200 million citizens of the Earth. What was the cause that brought these people together?...