. . . . "CO2"@en-us . "0"^^ . . . . . . . . . "0"^^ . . "110613550"@en-us . . . . "14796969-n"^^ . . "carbon dioxide"^^ . . "114796969"^^ . "carbonic acid gas"@en-us . . . "a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis"@en-us . . "113953879"@en-us . . . . . "carbon dioxide"@en-us . . .