Let's Do It! World is a global civic movement that started from Estonia, asking people worldwide to join a series of local, national and regional clean-up events. Among other projects, it is the founder of World Cleanup Day. The Let's Do It! movement was first conceived in Estonia in year 2008, where a country clean-up action called Let's do it! (in Estonian: "Teeme Ära!") cleaned up 10000 tons of illegal waste by more than 50000 volunteers in one day. Following Estonia's lead many countries also started their own country clean-up events. In 2011 a new initiative called Let's do it! World was started with the aim of promoting massive clean-ups from 24 March 2012 until 15 September 2012. After a successful World Cleanup 2012 project the next bigger goal was to have World Cleanup Day in 2018. Today, the movement has grown into a network of 113 countries. All together, 14 million participants have been engaged in movement's activities.
Since 2017, the movement uses the W sign aka "Three Fingers Up" as a symbol.
On the 3 May 2008 over 50000 people came out of their homes to clean up Estonia, the rest followed the process via all the media channels. That's 4% out of a population of 1.3 million - which would equal 15.3 million in the USA or 57 million in India. The idea spread from Estonia to the whole Europe and beyond. Next spring, in 2009, Latvia and Lithuania cleaned their countries with more than 250000 people participating and have done it henceforth for three years, engaging more people each year. On 20 March 2010 Portugal cleaned their country with 200000 people.Slovenia followed shortly, breaking all records with 270000 people (which is 13% of the overall population of the country) taking part in the action. In the beginning of June the same year, Kyiv, the capital of Ukraine was cleaned. By the end of 2011 more than 2.5 million people have participated in Let's Do It! cleanup actions in 16 countries – Estonia, India, Slovenia, Serbia, Finland, Romania, Latvia, Lithuania, Portugal, Bulgaria, Moldova, Ukraine, Cambodia, Russia, Hungary and Brazil.