I happened upon these glossaries the other day, as you do, whilst working on a translation project, and thought they might be worth sharing with you.

They were issued by the Intergovernmental Panel on Climate Change (IPCC), Task Force on National Greenhouse Gas Inventories.

• Here you can find the glossary in English.
• Here in Spanish.
• Here in French.

Please note that these are monolingual glossaries only and will require a fair amount on your part if you want to create a bilingual/multilingual glossary from them.

There might be other language versions lurking on that website, but so far my searches have been in vain.

P.S. Yes I know the picture is a bit of a stretch… 😉