Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EarthDay.org including 1 billion people in more than 193 countries. EARTHDAY.ORG is honored that the Biden Administration has decided to convene a global climate summit on Earth Day 2021 . Many important environmental events have happened on Earth Day since 1970, including the recent signing of the Paris Agreement, as Earth Day continues to be a momentous and unifying day each and every year. We look forward to being a part of this historic climate summit and making active progress to Restore Our Earth. The First Earth Day. Every year on April 22, Earth Day marks the anniversary of the birth of the modern environmental movement in 1970. Let’s take a look at the last half-century of mobilization for action: ORIGINS OF EARTH DAY. Earth Day 1970 gave a voice to an emerging public consciousness about the state of our planet.