Opened for signature in 1968, the Nuclear Non-Proliferation Treaty entered into force in 1970. On 11 May 1995, the Treaty was extended indefinitely. A total of 191 States have joined the Treaty, including the five nuclear-weapon States.
In which year was the first world environment day observed?
The day was first observed in 1974 in the city of Spokane in the USA. In 1972, the United Nations General Assembly established the World Environment Day on the first day of the Stockholm Conference on the Human Environment. Two years later, in 1974 the first WED was held with the theme "Only One Earth".
The transfer of sovereignty over Hong Kong, commonly known as the handover of Hong Kong (shortened to the Handover and the Return in mainland China), was the formal passing of responsibility for the territory of Hong Kong from the United Kingdom to the People's Republic of China at midnight on 1 July 1997.
Which of the following year is celebrated as International Year of Biodiversity?
The year 2008 was declared the International Year of the Potato by the United Nations, noting that the potato is a staple food in the diet of the world's population, and affirming the need to focus world attention on the role that the potato can play in providing food security and eradicating poverty.