Step 1: Understanding the Concept:
International observances are established by global organizations like the United Nations (UN) and the Food and Agriculture Organization (FAO) to raise public awareness about critical environmental issues, sustainable development, and resource conservation.
Step 2: Detailed Explanation:
World Soil Day (WSD) is celebrated annually on 5th December to focus global attention on the importance of healthy soil and to advocate for the sustainable management of soil resources.
The observance was officially recommended by the International Union of Soil Sciences (IUSS) in 2002.
Under the leadership of the Kingdom of Thailand and within the framework of the Global Soil Partnership, the FAO supported the formal establishment of WSD.
In December 2013, the UN General Assembly designated 5th December 2014 as the first official World Soil Day.
The date of 5th December was chosen because it coincides with the official birthday of the late H.M. King Bhumibol Adulyadej of Thailand, who was one of the most prominent promoters of soil science and sustainable soil management globally.
Step 3: Final Answer:
World Soil Day is celebrated every year on 5th December.