In September 2008, Estonian volunteers organized a nationwide cleanup, mobilizing over 50,000 people—5% of the population—in a single day. By 2019, it had grown into a global movement, with millions participating in over 180 countries. This past December, the UN declared September 20th 'World Cleanup Day' in recognition of its impact. Let’s celebrate by supporting nonprofits tackling the waste crisis and empowering communities to take action.