Earth Day
The first Earth Day "brought 20 million Americans out into the spring sunshine for peaceful demonstrations in favor of environmental reform." Earth Day is now observed in 192 countries, and coordinated by the nonprofit EARTHDAY.ORG (formerly Earth Day Network). According to Denis Hayes, the first Earth Day 1970 organizer and current Board Chair Emeritus of EARTHDAY.ORG, Earth Day is now "the largest secular day of protest in the world, and more than a billion people participate in Earth Day actions every year."