How could it happen that more than a dozen of the most prestigious scientific associations signed and submitted this letter on ‘climate change’ without having ensured that the used terminology is sufficiently defined. Read the rest of the entry
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?

Reference links :
How Spitsbergen Heats the World
NEW 2009


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”[1], 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[2] 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:

  1. The UNFCCC-CGE list, comparable to the IPCC list with 10 items, is rather short.
  2. The UNFCCC-CGE list does not even mention: climate, and climate change.
  3. Neither of the two lists defines ‘weather’.
  4. 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[3] ,

Glossary of Terms used in the IPCC Third Assessment Report[4]

 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 change
Climate feedback
Climate model (hierarchy)
Climate prediction
Climate projection
Climate scenario
Climate sensitivity
Climate system
Climate variability



[2] 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.

[3] GHG Inventories; Non Annex I; Training Package (CD ROM);



Essay 2010
Is the term ‚climate’ too unspecific?
Pages 10

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Essays from 1992 to 1997 on CLIMATE
by Dr. Arnd Bernaerts
“Legal Means for Understanding the Marine and climatic Change Issue”,
p.24 presented at the 28th Annual Conf. of the Law of the Sea Institute, Honolulu

“Conditions for the protection of the global climate”,
p.53 presented at GKSS Research Center Geesthacht


Black Sea-Model Case
--Paper, p.53
--Conf-Paper, p. 6


Four short texts
1994 Moscow

1994 LOS

1993 LOS

1992 Nature

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