UN-Water is the official convener of World Toilet Day. UN-Water maintains the official World Toilet Day website and chooses a special theme for each year. In 2020 the theme was "Sustainable sanitation and climate change". In 2019 the theme was 'Leaving no one behind', which is the central theme of the Sustainable Development Goals. Themes in previous years include nature-based solutions, wastewater, toilets and jobs, and toilets and nutrition. World Toilet Day is marked by communications campaigns and other activities. Events are planned by UN entities, international organizations, local civil society organizations and volunteers to raise awareness and inspire action.