18. List of environmental events

This is a list of environmental events. These dates are designated for creating awareness of environmental issues.
  DAYS

• World Wetlands Day - February 2
• UN World Water Day - March 22
• Earth Day - April 22
• Arbor Day - Last Friday in April (each state also has its own observation based on best tree planting time)
• International Migratory Bird Day - May 3
• Greenery Day - May 4 in Japan (previously April 29)
• International Day for Biological Diversity (World Biodiversity Day) - May 22
• Bike-to-Work Day - Third Friday in May
• UN World Environment Day - June 5
• World Oceans Day - June 8
• UN World Day to Combat Desertification and Drought - June 17
• UN World Population Day - July 11
• International Day for the Preservation of the Ozone Layer - September 16
• Clean Up the World Weekend - September 17-19
• Zero Emissions Day - September 21
• Car Free Day - September 22
• Ecological Debt Day (Earth Overshoot Day) - September 23 in 2008, but receding
• World Rivers Day - every last Sunday in September
• UN World Habitat Day - first Monday in October
• International Day for Natural Disaster Reduction - second Wednesday in October
• World Planting Day - October 22
• International Day of Climate Action - October 24
• International Day for Preventing the Exploitation of the Environment in War and Armed Conflict - November 6
• World Soil Day - December 5
• International Mountain Day - December 11
• Ozone Action Day - at certain times during the summer months
• eDay - variable date

  WEEKS

• Bike to Work Week Victoria
• National Clean Beaches Week - July 1 to 7
• Conservation Week
• European Mobility Week - September 16 to 22
• Bike Week - second week in June
• Recycle Week- 20 to 26 June 2011
• Green Office Week
• European Week for Waste Reduction (EWWR) - 9 days, last complete week in November
• No Car Day - China, week of September 22

  YEARS

• International Polar Year - 1882–1883
• International Polar Year - 1932–1933
• 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 - 2009 
• International Year of Biodiversity - 2010
• International Year of Forests - 2011

DECADES

• UN decade on water - 1981-1990
• International Decade for Natural Disaster Reduction - 1990s
• United Nations Decade of Education for Sustainable Development - 2005-2014
• International Decade on Water for Life - 2005-2015