The correct answer is: A. 17 June
World Day to Combat Desertification and Drought is observed on 17 June every year. It was established by the United Nations General Assembly in 1994 to promote public awareness of the importance of combating desertification and drought.
Desertification is the degradation of land in arid, semi-arid and dry sub-humid areas. It is caused by human activities such as overgrazing, deforestation, and unsustainable agriculture, as well as by climate change. Drought is a period of time when there is less than normal rainfall. It can cause crop failures, water shortages, and wildfires.
World Day to Combat Desertification and Drought is an opportunity to raise awareness of the causes and effects of desertification and drought, and to promote sustainable land management practices.
Here is a brief explanation of each option:
- Option A: 17 June is the correct answer.
- Option B: 20 June is the World Refugee Day.
- Option C: 17 April is the World Health Day.
- Option D: 20 July is the Nelson Mandela International Day.