The first Earth Day was celebrated in 1970, when over 20 million Americans took to the streets to demonstrate against the harmful impact of industry on the planet. From oil spills, polluting factories and power plants, raw sewage, toxic dumps, pesticides, freeways, to the loss of wilderness and the extinction of wildlife, people of diverse backgrounds and interest groups united and campaigned for change.
Over 50 years later, Earth Day is widely recognized as “the largest secular observance....