From a forthcoming essay of mine in Issues in Science and Technology:

“Believe it or not, the Framework Convention on Climate Change (FCCC), focused on international policy, and the Intergovernmental Panel on Climate Change (IPCC), focused on scientific assessments in support of the FCCC, use different definitions of climate change. The two definitions are not compatible, certainly not politically and perhaps not even scientifically. This lack of coherence has contributed to the current international stalemate on climate policy, a stalemate that matters because climate change is real and actions are needed to improve energy policies and to reduce the vulnerability of people and ecosystems to climate effects.”

Read the whole thing.