| Year | Theme | Host city |
| 1972 | Stockholm Conference on Human Environment | Stockholm, United Nations |
| 1973 | | Geneva, Switzerland |
| 1974 | Only one Earth during Expo '74 | Spokane, United States |
| 1975 | Human Settlements | Chandigarh, India |
| 1976 | Water: Vital Resource for Life | Ontario, Canada |
| 1977 | Ozone Layer Environmental Concern; Lands Loss and Soil Degradation | Delhi, India |
| 1978 | Development Without Destruction | Sylhet, Bangladesh |
| 1979 | Only One Future for Our Children – Development Without Destruction | Sylhet, Bangladesh |
| 1980 | A New Challenge for the New Decade: Development Without Destruction | Sylhet, Bangladesh |
| 1981 | Ground Water; Toxic Chemicals in Human Food Chains | Sylhet, Bangladesh |
| 1982 | Ten Years After Stockholm (Renewal of Environmental Concerns) | Dhaka, Bangladesh |
| 1983 | Managing and Disposing Hazardous Waste: Acid Rain and Energy | Sylhet, Bangladesh |
| 1984 | Desertification | Rajshahi, Bangladesh |
| 1985 | Youth: Population and the Environment | Islamabad, Pakistan |
| 1986 | A Tree for Peace | Ontario, Canada |
| 1987 | Environment and Shelter: More Than A Roof | Nairobi, Kenya |
| 1988 | When People Put the Environment First, Development Will Last | Bangkok, Thailand |
| 1989 | Global Warming; Global Warning | Brussels, Belgium |
| 1990 | Children and the Environment | Mexico City, Mexico |
| 1991 | Climate Change. Need for Global Partnership | Stockholm, Sweden |
| 1992 | Only One Earth, Care and Share | Rio de Janeiro, Brazil |
| 1993 | Poverty and the Environment – Breaking the Vicious Circle | Beijing, China |
| 1994 | One Earth One Family | London, United Kingdom |
| 1995 | We the Peoples: United for the Global Environment | Pretoria, South Africa |
| 1996 | Our Earth, Our Habitat, Our Home | Istanbul, Turkey |
| 1997 | For Life on Earth | Seoul, South Korea |
| 1998 | For Life on Earth – Save Our Seas | Moscow, Russia |
| 1999 | Our Earth – Our Future – Just Save It! | Tokyo, Japan |
| 2000 | The Environment Millennium – Time to Act | Adelaide, Australia |
| 2001 | Connect with the World Wide Web of Life | Turin, Italy and Havana, Cuba |
| 2002 | Give Earth a Chance | Shenzhen, China |
| 2003 | Water – Two Billion People are Dying for It! | Beirut, Lebanon |
| 2004 | Wanted! Seas and Oceans – Dead or Alive? | Barcelona, Spain |
| 2005 | Green Cities – Plant for the Planet! | San Francisco, United States |
| 2006 | Deserts and Desertification – Don't Desert Drylands! | Algiers, Algeria |
| 2007 | Melting Ice – a Hot Topic? | London, United Kingdom |
| 2008 | Kick The Habit – Towards A Low Carbon Economy | Wellington, New Zealand |
| 2009 | Your Planet Needs You – Unite to Combat Climate Change | Mexico City, Mexico |
| 2010 | Many Species. One Planet. One Future | Rangpur, Bangladesh |
| 2011 | Forests: Nature at your Service | Delhi, India |
| 2012 | Green Economy: Does it include you? | Brasília, Brazil |
| 2013 | Think.Eat.Save. Reduce Your Foodprint | Ulaanbaatar, Mongolia |
| 2014 | Raise your voice, not the sea level | Bridgetown, Barbados |
| 2015 | Seven Billion Dreams. One Planet. Consume with Care. | Rome, Italy |
| 2016 | Zero Tolerance for the Illegal Wildlife trade | Luanda, Angola |
| 2017 | Connecting People to Nature – in the city and on the land, from the poles to the equator | Ottawa, Canada |
| 2018 | Beat Plastic Pollution | New Delhi, India |
| 2019 | Beat Air Pollution | China |
| 2020 | Time for Nature | Colombia |
