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| Subject | English | Thesaurus |
| ecol. | carbon dioxide methanation process | carbon dioxide-to-methane conversion (MichaelBurov) |
| ecol. | carbon dioxide-to-methane conversion | carbon dioxide methanation (process) (MichaelBurov) |
| abbr., O&G, sakh. | chemical abbreviation for carbon dioxide CO2 | CO2 |