In 2012, the United Nations General Assembly proclaimed March 21 the International Day of Forests.
Forests provide priceless ecological, economic, social and health benefits. Covering over a third of the planet, forests perform vital functions, including combating climate change and contributing to the prosperity and well-being of humanity. They play a crucial role in alleviating poverty and in achieving Sustainable Development Goals (SDGs). Many cultures depend on forests for their livelihoods, medicines, fuel, food, and shelter. Yet, global deforestation continues. International Day of Forests celebrates and raises awareness of the value of forests and provides the opportunity for local, national, and international activities, such as tree planting campaigns. This year, the theme is “Forest restoration: a path to recovery and well-being.”
Here are some links that will help you observe this day:
https://www.un.org/en/observances/forests-and-trees-day
http://www.fao.org/international-day-of-forests/en/