Free Press: On the first Earth Day in 1970, 20 million people raised their voices for the environment. Their energy sparked a movement that now engages more than 1 billion people, in almost every country in the world.
Earth Day continues to be the single largest annual secular event in history. The sheer size of the first protest - along with increasing visual evidence of dire health threats associated with air and toxic pollution - forced Congress to pass some of the world's toughest environmental laws,...