Butunjahon atrof-muhit kuni — har yili 5-iyun kuni nishonlanadi va Birlashgan Millatlar Tashkilotining atrof-muhitni muhofaza qilish bo'yicha xabardorlikni va harakatni rag'batlantirishning asosiy vositasi hisoblanadi. Birinchi marta 1973-yilda o'tkazilgan. U dengiz ifloslanishi, aholining haddan tashqari ko'payishi, global isish, barqaror rivojlanish va yovvoyi tabiat jinoyatlari kabi atrof-muhit muammolari haqida xabardorlikni oshirish uchun platforma bo'ldi. Butunjahon atrof-muhitni muhofaza qilish kuni har yili 143 dan ortiq mamlakatlar ishtirokida jamoatchilikni targ'ib qilish uchun global platformadir. Har yili dastur biznes, nodavlat tashkilotlar, jamoalar, hukumatlar va taniqli shaxslar uchun atrof-muhit sabablarini himoya qilish uchun mavzu va forum taqdim etadi. (BMTning boshqa rasmiy tillarida: inglizchaWorld Environment Day, arabchaạlywm ạlʿạlmy llbyẗẗ, ispanchaDía mundial del medio ambiente, xitoychashīngāngāngì, fransuzchaJournée mondiale de l'environ) odamlarning e'tiborini sayyoradagi atrof-muhit duch keladigan muammolarga qaratish.
Birlashgan Millatlar Tashkiloti Bosh Assambleyasining 27-sessiyasida 1972-yil 15-dekabrda e'lon qilingan. 1972-yil 5-iyun inson muhiti bo'yicha Stokgolm konferentsiyasining boshlanishi sanasi sifatida tanlandi. Bosh Assambleya o‘z rezolyutsiyasida BMT tizimidagi davlatlar va tashkilotlarni har yili shu kuni atrof-muhitni asrash va yaxshilashga intilishlarini tasdiqlovchi tadbirlar o‘tkazishga chaqiradi. Shuningdek, Bosh Assambleyaning 27-sessiyasida BMT tizimidagi yangi tashkilot – Birlashgan Millatlar Tashkilotining Atrof-muhit bo‘yicha dasturi (YUNEP) tuzildi. YUNEP homiyligida har yili Butunjahon atrof-muhit kuni nishonlanadi.
Har yili mavzu va shior aniqlanadi, asosiy xalqaro tadbirlarni o'tkazish joyi tanlanadi.
2022-yil – "Only One Earth"
2021-yil – "Ecosystem restoration"
2020-yil – "Time for Nature"
2019-yil – "Beat Air Pollution"
2018-yil – "Beat Plastic Pollution"
2017-yil – "Connecting People to Nature – in the city and on the land, from the poles to the equator"
2016-yil – "Zero Tolerance for the Illegal Wildlife trade"
2015-yil – "Seven Billion Dreams. One Planet. Consume with Care."
2014-yil – "Raise your voice, not the sea level"
2013-yil – "Think.Eat.Save. Reduce Your Foodprint"
2012-yil – "Green Economy: Does it include you?"
2011-yil – "Forests: Nature at your Service"
2010-yil – "Many Species. One Planet. One Future"
2009-yil – "Your Planet Needs You – Unite to Combat Climate Change"
2008-yil – "Kick The Habit – Towards A Low Carbon Economy"
2007-yil – "Melting Ice – a Hot Topic?"
2006-yil – "Deserts and Desertification – Don't Desert Drylands!"
2005-yil – "Green Cities – Plant for the Planet!"
2004-yil - "Wanted! Seas and Oceans – Dead or Alive?"
2003-yil - "Water – Two Billion People are Dying for It!"
2002-yil - "Give Earth a Chance"
2001-yil - "Connect with the World Wide Web of Life"
2000-yil – "The Environment Millennium – Time to Act"
1999-yil – "Our Earth – Our Future – Just Save It!"
1998-yil – "For Life on Earth – Save Our Seas"
1997-yil – "For Life on Earth"
1996-yil – "Our Earth, Our Habitat, Our Home"
1995-yil – "We the Peoples: United for the Global Environment"
1994-yil – "One Earth One Family"
1993-yil – "Poverty and the Environment – Breaking the Vicious Circle"
1992-yil – "Only One Earth, Care and Share"
1991-yil – "Climate Change. Need for Global Partnership"
1990-yil – "Children and the Environment"
1989-yil – "Global Warming; Global Warning"
1988-yil – "When People Put the Environment First, Development Will Last"
1987-yil – "Environment and Shelter: More Than A Roof"
1986-yil – "A Tree for Peace"
1985-yil – "Youth: Population and the Environment"
1984-yil – "Desertification"
1983-yil – "Managing and Disposing Hazardous Waste: Acid Rain and Energy"
1982-yil – "Ten Years After Stockholm (Renewal of Environmental Concerns)"
1981-yil – "Ground Water; Toxic Chemicals in Human Food Chains"
1980-yil – "A New Challenge for the New Decade: Development Without Destruction"
1979-yil – "Only One Future for Our Children – Development Without Destruction"
1978-yil – "Development Without Destruction"
1977-yil – "Ozone Layer Environmental Concern; Lands Loss and Soil Degradation"