The Partnership for Action on Green Economy (PAGE), a UN mechanism to assist countries transition towards greener and more inclusive economies, emerged at

1. The question asks about the origin of the Partnership for Action on Green Economy (PAGE), identifying it as a UN mechanism to help countries transition towards greener and more inclusive economies. 2. Option (A) refers to the World Summit on Sustainable Development (WSSD) in Johannesburg. 3. Option (B) refers to the United Nations Conference on Sustainable Development (Rio+20) held in Rio de Janeiro in 2012. It was at this conference that the concept of the green economy was a major focus, and PAGE was launched in response to the outcomes of Rio+20 to support countries interested in pursuing greener economic pathways. 4. Option (C) refers to the UNFCCC conference that led to the Paris Agreement, focused primarily on climate change. 5. Option (D) refers to a summit organized by The Energy and Resources Institute (TERI) in New Delhi. 6. Therefore, PAGE emerged at the United Nations Conference on Sustainable Development 2012, Rio de Janeiro.