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