Earth Day
Context
An annual event on April 22 to demonstrate support for environmental protection
Explanation
First celebrated in 1970, Earth Day now includes a wide range of events coordinated globally by EARTHDAY.ORG, including 1 billion people in more than 193 countries.
Applications
Activities include planting trees, cleaning up trash, and campaigning for environmental policy changes.
The day focuses on promoting awareness of the Earth's environment and pressing environmental issues.
It's a day of action that changes human behavior and provokes policy changes.