Correct Option (B)
The United Nations Framework Convention on Climate Change (UNFCCC) was adopted at the United Nations Conference on Environment and Development (UNCED), also known as the Earth Summit, held in Rio de Janeiro, Brazil, in 1992. The primary objective of the UNFCCC is to stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic interference with the climate system. This foundational treaty subsequently led to the development of agreements such as the Kyoto Protocol (1997) and the Paris Agreement (2015).
Incorrect Options
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United Nations Conference on the Human Environment, Stockholm, 1972: This conference marked the first major international gathering on environmental issues, leading to the creation of the United Nations Environment Programme (UNEP). However, the UNFCCC was not established at this event.
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World Summit on Sustainable Development, Johannesburg, 2002: This summit focused on reviewing the progress made since the 1992 Earth Summit and reaffirming global commitment to sustainable development. It did not originate the UNFCCC.
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UN Climate Change Conference, Copenhagen, 2009: The Copenhagen Conference (COP15) was the 15th Conference of the Parties to the UNFCCC. It was a significant meeting within the ongoing UNFCCC process, aiming to establish a new global climate agreement, but it was not the event where the treaty itself was drawn.