Keep America Beautiful's Great American Cleanup is the nation’s largest community improvement program, engaging more than 5 million volunteers and participants every year to create positive change and lasting impact in local communities.

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. 

Arbor Day is a secular day of observance in which individuals and groups are encouraged to plant trees. Today, many countries observe such a holiday. Though usually observed in the spring, the date varies, depending on climate and suitable planting season.

The International Coastal Cleanup (ICC) is the world's largest, volunteer effort to clean up the marine environment. Every year, volunteers from over 100 countries descend on local beaches, rivers, lakes, and canals to show their commitment to cleaner waterways. The Ocean Conservancy, the world's largest organization focusing exclusively on the health of the marine environment, has sponsored this annual event for the past 37 years.