| A1 | A family of scenarios in the IPCC Special Report on Emission Scenarios; see glossary under SRES scenarios |
| A1T | One of the six SRES marker scenarios; see glossary under SRES scenarios |
| A1B | One of the six SRES marker scenarios; see glossary under SRES scenarios |
| A1FI | One of the six SRES marker scenarios; see glossary under SRES scenarios |
| A2 | A family of scenarios in the IPCC Special Report on Emission Scenarios; also one of the six SRES marker scenarios; see glossary under SRES scenarios |
| AOGCM | Atmosphere-Ocean General Circulation Model; see glossary under climate model |
| B1 | A family of scenarios in the IPCC Special Report on Emission Scenarios; also denotes one of the six SRES marker scenarios; see glossary under SRES scenarios |
| B2 | A family of scenarios in the IPCC Special Report on Emission Scenarios; also denotes one of the six SRES marker scenarios; see glossary under SRES scenarios |
| CH4 | Methane; see glossary |
| CFC | Chlorofluorocarbon; see glossary |
| CO2 | Carbon dioxide; see glossary |
| EIT | Economies in transition; see glossary |
| EMIC | Earth Model of Intermediate Complexity |
| ENSO | El Niño-Southern Oscillation; see glossary |
| F-Gases | Fluorinated gases covered under the Kyoto Protocol; see glossary under F-Gases |
| GDP | Gross Domestic Product; see glossary |
| HCFC | Hydrochlorofluorocarbon; see glossary |
| HFC | Hydrofluorocarbon; see glossary |
| LOSU | Level of scientific understanding; see glossary |
| MOC | Meridional overturning circulation; see glossary |
| N2O | Nitrous oxide; see glossary |
| OECD | Organisation for Economic Cooperation and Development; see www.oecd.org |
| PFC | Perfluorocarbon; see glossary |
| pH | See glossary under pH |
| PPP | Purchasing Power Parity; see glossary |
| RD&D | Research, development and demonstration |
| SCM | Simple Climate Model |
| SF6 | Sulfur hexafluoride; see glossary |
| SRES | Special Report on Emission Scenarios; see glossary under SRES scenarios |
| UNFCCC | United Nations Framework Convention on Climate Change; see www.unfccc.int |