| Name | Date |
|---|
| World Wetlands Day | 02-02: February 2 |
| International Polar Bear Day | 02-27: February 27 |
| World Wildlife Day | March 3 |
| Solar Appreciation Day | Second Friday of March |
| International Day of Action for Rivers[2] | 03-14: March 14 |
| World Consumer Rights Day | 03-15 : March 15 |
| Global Recycling Day[3] | 03-18: March 18th |
| Taxonomist Appreciation Day | 03-19 : March 19 |
| World Sparrow Day | 03-20: March 20 |
| International Day of Forests | 03-21: March 21 |
| World Planting Day | 03-21: March 21 |
| World Wood Day | 03-21: March 21 |
| World Water Day | 03-22: March 22 |
| Earth Day | 04-22: April 22[4] |
| World Fish Migration Day | April 21, 2018 |
| Day of Remembrance for all Victims of Chemical Warfare | 04-29: April 29 |
| Green Up Day | 05: First Saturday of May in Vermont |
| Greenery Day | 05-04: May 4 in Japan (previously April 29) |
| World Migratory Bird Day[5] | Second Saturday of May |
| International Migratory Bird Day | Second Saturday of May in the U.S. and Canada; Second Saturday of October in Mexico, Central and South America, and the Caribbean. |
| Endangered Species Day[6] | 05: Third Friday of May |
| International Day for Biological Diversity (World Biodiversity Day) | 05-22: May 22 |
| World Turtle Day | 05-23: May 23 |
| European Day of Parks - Europarc Federation[7] | 05-24: May 24 |
| Bike-to-Work Day | 05: Third Friday of May |
| World No Tobacco Day | 05-31:May 31 |
| World Environment Day | 06-05: June 5 |
| World Oceans Day | 06-08: June 8 |
| Coral Triangle Day | 06-09: June 9 |
| Global Wind Day | 06-15: June 15 |
| World Sea Turtle Day[8] | 06-16: June 16 |
| World Day to Combat Desertification and Drought | 06-17: June 17 |
| World Giraffe Day[9] | 06-21: June 21 |
| World Population Day | 07-11: July 11 |
| International Tiger Day | 07-29: July 29 |
| World Ranger Day - International Ranger Federation | July 31 |
| World Lion Day[10] | 08-10: August 10 |
| World Elephant Day | 08-12: August 12 |
| World Orangutan Day | 08-19: August 19 |
| National Honey Bee Day | 08-22: August 22 |
| Amazon Rainforest Day | 09-05: September 5 |
| International Day for the Preservation of the Ozone Layer | 09-16: September 16 |
| World Cleanup Day[11] | 09: September 21, 2019, Third Saturday in September |
| World Water Monitoring Day | 09-18: September 18 |
| Zero Emissions Day[12] | 09-21: September 21 |
| Car Free Day | 09-22: September 22 |
| World Rhino Day[13] | 09-22: September 22 |
| Ecological Debt Day (Earth Overshoot Day) | 09-23: September 23 in 2008, but receding |
| World Environmental Health Day[14] | 09-26: September 26 since 2011 (IFEH)[15] |
| World Rivers Day[16] | 09: Last Sunday of September |
| World Habitat Day | 10: First Monday of October |
| World Animal Day | 10-04: October 4 |
| Energy Efficiency Day[17] | 10-05: October 5 since 2016 |
| International Day for Natural Disaster Reduction | 10: October 13 |
| Sustainability Day[18] | 10: Fourth Wednesday of October |
| International Snow Leopard Day[19][20] | October 23 |
| International Day of Climate Action | 10-24: October 24 |
| World Vegan Day | 11-01: November 1 |
| International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | 11-06: November 6 |
| America Recycles Day | 11-15: November 15 |
| World Soil Day[21] | 12-05: December 5 |
| International Mountain Day | 12-11: December 11 |
| Ozone Action Day | Variable date depending weather conditions |
| eDay - Electronic Waste Day | Variable date, in New Zealand |
| Name | Date |
|---|
| Green Office Week | 2016 date, April 18-22 |
| Keep Australia Beautiful Week[22] | Last full week of August |
| National Green Week | 02 (first week in February every year in the United States) |
| National Wildlife Week[23] |
| National Dark-Sky Week | 04 (week of new moon in April) |
| Bike to Work Week Victoria |
| National Pollinator Week[24] | third week in June |
| National Clean Beaches Week, Van Mohatsav Saptah(Forest Festival Week) | 07-01 to 07-07: July 1 to 7 |
| Conservation Week |
| European Mobility Week | 09-16 to 09-22: September 16 to 22 |
| Bike Week | 06: second week in June |
| Recycle Week[25] | 06: 20 to 26 June 2011 |
| [https://www.zerowasteweek.co.uk/ Zero Waste Week] | first week of September |
| Green Office Week |
| European Week for Waste Reduction (EWWR) | 11: 9 days, last complete week in November |
| No Car Day | 09: China, week of September 22 |
| World Water Week in Stockholm | 08 or 09: each year in August or September |
| National Op Shop Week (Australia) | August 21st - 27th |
| Name | Date |
|---|
| International Polar Year | 1882–1883 |
| International Polar Year | 1932–1933 |
| International Polar Year | 2007-2008 |
| World Population Year | 1974 |
| International Year of the Ocean (IYO) | 1998 |
| International Year of Mountains (IYM) | 2002 |
| International Year of Ecotourism (IYE) | 2002 |
| International Year of Freshwater (IYF) | 2003 |
| International Year of Deserts and Desertification | 2006 |
| International Year of the Dolphin | 2007–2008 |
| International Polar Year | 2007–2009 |
| International Year of Planet Earth | 2008 |
| International Year of Sanitation | 2008 |
| International Year of Natural Fibres 2009 |
| Year of the Gorilla[26] | 2009 |
| International Year of Biodiversity | 2010 |
| International Year of Forests | 2011 |
| International Year of Soils | 2015 |
| International Year of Pulses | 2016 |
| International Year of Sustainable tourism for all | 2017 |
1. ^http://www.earthhour.org
2. ^https://www.internationalrivers.org/ International Day of Action for Rivers
3. ^https://www.globalrecyclingday.com/ Global Recycling Day
4. ^{{cite web|author= |url=http://www.earthday.org |title=Earth Day Network | Earth Day 2015 |publisher=Earthday.org |date=2015-04-22 |accessdate=2015-05-16}}
5. ^World Migratory Bird Day
6. ^Endangered Species Coalition - Endangered Species Day
7. ^https://www.europarc.org/nature/european-day-of-parks/ European Day of Parks
8. ^https://www.wwf.org.uk/updates/world-sea-turtle-day World Sea Turtle Day
9. ^https://giraffeconservation.org/world-giraffe-day/ World Giraffe Day
10. ^https://www.worldlionday.com/ World Lion Day
11. ^World Cleanup Day
12. ^Zero Emissions Day
13. ^World Rhino Day
14. ^[https://anydayguide.com/calendar/1252 World Environmental Health Day]
15. ^International Federation of Environmental Health
16. ^World Rivers Day
17. ^https://energyefficiencyday.org/ Energy Efficiency Day
18. ^[https://www.uvu.edu/sustainability/sustainabilityday/index.html Sustainability Day]
19. ^https://www.snowleopard.org/international-snow-leopard-day-hope-and-concern-for-the-cat/ |International Snow Leopard Day 2014
20. ^http://www.globalsnowleopard.org/wp-content/uploads/2015/07/SnowLeopard_Bishkek_Declaration_EN.pdf.pdf |The Bishkek Declaration on the Conservation of Snow Leopards
21. ^World Soil Day
22. ^Keep Australia Beautiful Week
23. ^National Wildlife Week
24. ^National Pollinator Week
25. ^Recycle Week
26. ^Year of the Gorilla