Here is a comprehensive list of the sources used for the Glossary of this website:
BMU - German Federal Ministry for the Environment, Nature Conservation and Nuclear
Safety:
Glossar
EEA - European Environment Agency: EEA multilingual environmental glossary
G-20 - Group of Twenty:
About G-20
IEA - International Energy Agency: Energy Efficiency
IEA - International Energy Agency: Energy Statistics Manual
IEA - International Energy Agency: Statistics, Definitions, TPES
IIEC - International Institute for Energy Conservation: Energy Standards & Labeling
IPCC - International Panel on Climate Change: Glossary
MIT - Massachusetts Institute of Technology: The Future of Nuclear Power
OECD - Organisation for Economic Co-operation and Development: Glossary of Statistical Terms
OECD - Organisation for Economic Co-operation and Development: About the OECD
UNFCCC - United Nations Framework Convention on Climate Change: Glossary of climate change acronyms
U.S. EPA - U.S. Environmental Protection Agency: Terms of Environment: Glossary, Abbreviations and Acronyms
WTO - World Trade Organization: Glossary