The Intergovernmental Panel on Climate Change is a scientific body established by UNEP and WMO to provide comprehensive assessments of climate change. It synthesises peer reviewed research on the physical science basis,impacts and response strategies. Its reports inform international negotiations and national policies. Thus the description in the question clearly points to the IPCC.
Option A:
UNEP,the United Nations Environment Programme,coordinates environmental activities within the UN system and assists developing countries. While it supports IPCC work,it is not itself the scientific assessment panel described in the stem. Therefore it is not the correct answer.
Option B:
UNDP,the United Nations Development Programme,focuses on development issues such as poverty reduction,governance and resilience. It uses climate information but does not produce global scientific assessments of climate change. Hence it does not match the concept in the question.
Option C:
UNFCCC,the United Nations Framework Convention on Climate Change,is the international treaty that provides the political framework for climate negotiations. It relies on IPCC assessments for scientific guidance but is not the assessment body itself. Therefore it is not the right option here.
Option D:
The Intergovernmental Panel on Climate Change regularly publishes assessment reports,special reports and methodology guidelines. By evaluating existing scientific literature,it offers authoritative syntheses rather than conducting original research. This role matches exactly what the question describes.
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