酸化 さんか炭素 たんそ吸収 きゅうしゅう げんでしょう
nisankatansokyūshūge ndeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 二酸化炭素吸収源

1. Carbon sink, probably.; Probably a carbon sink.

Polite
Presumptive
Conjecture