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. The official theme for 2022 is Invest In Our Planet.

Arbor Day, much like Earth Day, is a holiday that celebrates nature. Its purpose is to encourage people to plant trees, and many communities traditionally take the opportunity to organize tree-planting and litter-collecting events on or around the holiday.