The Earth Day 2022 theme is Invest in Our Planet and features five primary programs: The Great Global Cleanup, Sustainable Fashion, Climate and Environmental Literacy, Canopy Project, Food and Environment, and the Global Earth Challenge

Today, Earth Day is widely recognized as the largest secular observance in the world, marked by more than a billion people every year as a day of action.
Thanks largely to the momentum created by Earth Day, the early 1970s saw the passage of the most important environmental legislation in US history, including both the Clean Air and Clean Water acts.
Source: Earth Day – Wikipedia