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World Water Day is a United Nations day observed each year on 22 March to highlight the importance of freshwater.
Arbor Day (or Arbour Day in some countries) is a secular day of observance in which individuals and groups are encouraged to plant trees.
World Day to Combat Desertification and Drought is a global observance held on June 17th each year to raise awareness about the issues of desertification and drought, and to promote efforts to combat them.