The UNFCCC does not define ‘climate’ at all, while
WMO says: 'climate' is average weather.
This website will provide information and ask, does science know what climate is?
UNFCCC’s “Glossary of climate change acronyms”
– Two UNFCCC glossaries with surprises -
The website of UNFCCC secretariat provides access to a Glossary under the section “Essential Background”, to a “Glossary of climate change acronyms”, which actually offers not one item containing the word ‘climate’. One can only wonder while the page is titled: “Glossary of climate change acronyms”.
Under the auspices of UNFCCC there is one more Glossary available (excerpt see Box), which is introduced as follows:
- The materials contained in this Consultative Group of Experts training package, on national greenhouse gas (GHG) inventories, intends to provide the reader with the best possible synthesis of all the Intergovernmental Panel on Climate Change (IPCC) methodologies and tools available.
- The present training package is directly designed to address the UNFCCC guidelines for the preparation of national communications from Parties not included in Annex I to the Convention, and is in no case intended to replace any of the IPCC methodologies or tools it is referring to in its various modules.
- For further detail and explanation, the reader is therefore always encouraged to go back to the original IPCC documents or tools referred to.
It is interesting to note:
The UNFCCC-CGE list, comparable to the IPCC list with 10 items, is rather short.
The UNFCCC-CGE list does not even mention: climate, and climate change.
Neither of the two lists defines ‘weather’.
While the IPCC Report defines climate as ‘average weather’, it would have been necessary to define ‘weather’ in the first place.
| UNFCCC - Consultative Group of Experts training package- Glossary ,
Glossary of Terms used in the IPCC Third Assessment Report
Climate feedback. An atmospheric, oceanic, terrestrial, or other process that is activated by direct climate change induced by changes in radiative forcing. Climate feedbacks may increase (positive feedback) or diminish (negative feedback) the magnitude of the direct climate change.
Climate lag. The delay that occurs in climate change as a result of some factor that changes very slowly. For example, the effects of releasing more carbon dioxide into the atmosphere may not be known for some time because a large fraction is dissolved in the ocean and only released to the atmosphere many years later.
Climate sensitivity. The equilibrium response of the climate to a change in radiative forcing; for example, a doubling of the carbon dioxide concentration. See radiative forcing.
Climate system (or Earth system). The atmosphere, the oceans, the biosphere, the cryosphere, and the geosphere, together make up the climate system.
Climate in a narrow sense is usually defined as the “average weather” or more rigorously as the statistical description in terms of the mean and variability of relevant quantities over a period of time ranging from months to thousands or millions of years. The classical period is 30 years, as defined by the World Meteorological Organization (WMO). These relevant quantities are most often surface variables such as temperature, precipitation, and wind. Climate in a wider sense is the state, including a statistical description, of the climate system.
Climate model (hierarchy)
 In a site box the UNFCCC soft ware is introduced: In order to facilitate the tasks of non-Annex I Parties, the UNFCCC secretariat produced a software which incorporates all the elements a national GHG inventory could contain according to decision 17/CP.8. It is hoped that this software is flexible enough to accommodate the great variety of needs and constraints faced by non-Annex I Parties.
 GHG Inventories; Non Annex I; Training Package (CD ROM);