In 1970, 20 million people showed up to fight for the environment on the first Earth Day. But more than five decades later – is it time for this much tamer global event to return to its radical roots? Organizer Denis Hayes recounts how – amidst other counterculture movements at the time – he transformed Earth Day from a campus teach-in to a national protest. As he approaches 80, Denis offers his best OG advice to the next generation of climate leaders. Then, environmental warriors Maria Blancas and Axcelle Campana share ideas on what a revamped Earth Day could look like – including making it a public holiday.