DENIS HAYES: Mr. Earth Day Gets Ready to Rumble

Where do you go when you need someone to rally 200 million people? An ex-President, perhaps, or a former dictator? Whenever the environmental movement needs someone to gather the troops worldwide, it turns to a tall, understated activist who rides his bicycle to work, wears flannel shirts and has a unique ability to herd the masses toward a common goal. His name is Denis Hayes, but you can call him Mr. Earth Day. He launched the first one in April 1970, turned it into a global festival for Earth Day 1990 and is looking ahead to the biggest eco-event he can...