Which framework convention was adopted at the 1992 Rio Earth Summit to address the issue of climate change?

The correct option is UNFCCC.

Explanation

The United Nations Conference on Environment and Development (UNCED), also known as the Rio Earth Summit, was held in Rio de Janeiro in 1992. It resulted in the adoption of key documents (such as Agenda 21 and the Rio Declaration) and opened major environmental treaties for signature, known collectively as the "Rio Conventions."

Option Analysis:

• UNFCCC UNFCCC (Correct): The United Nations Framework Convention on Climate Change was adopted and opened for signature at the Rio Earth Summit in 1992. It is the primary international treaty for addressing climate change, with the objective of stabilizing greenhouse gas concentrations in the atmosphere.
• CBD CBD (Incorrect): The Convention on Biological Diversity was also opened for signature at the 1992 Rio Earth Summit. However, its mandate is the conservation of biodiversity and sustainable use of genetic resources, not climate change.
• UNCCD UNCCD (Incorrect): The United Nations Convention to Combat Desertification is considered one of the three Rio Conventions because it was recommended under Agenda 21 at the summit. However, the convention text itself was adopted later in 1994. It addresses land degradation and drought.
• UNCLOS UNCLOS (Incorrect): The United Nations Convention on the Law of the Sea was adopted in 1982, a decade before the Rio Summit. It governs marine and maritime activities.

Key Takeaway:
The Rio Earth Summit (1992) led to the establishment of three "Rio Conventions": UNFCCC (Climate Change), CBD (Biodiversity), and UNCCD (Desertification, adopted 1994).