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Following the success of the first Earth Day, Hayes founded the Earth Day Network and served as international chairman for Earth Day's anniversaries in 1990 and 2000. Internationally, he is recognized for expanding the Earth Day Network to more than 180 nations. It is now the world’s most widely observed secular holiday. Hayes continues to chair the board of the international Earth Day Network and is the Chair of the Earth Day 2010 Global Advisory Committee. Earth Day is celebrating its 50th Anniversary in April, 2020, and will mark the day with environmental activism across the globe [www.earthdaynetwork.org].