毎(まい)日(にち) mainichi大(たい)量(りょう) tairyouの no二(に)酸(さん)化(か)炭(たん)素(そ) nisankatansoが ga生(せい)成(せい) seiseiされている sareteiru。 Large amounts of carbon dioxide are being produced every day. Literal Every-day large-quantity [possessive-の] carbon-dioxide [subject-が] is-being-produced. 生成される is formal/technical — 生成 ('production/generation') + される (passive). 二酸化炭素 is the chemical term for CO₂: 二 (two) + 酸化 (oxide) + 炭素 (carbon). The sentence reads like a science text or news report. sciencetechnologyenvironment~ている (ongoing state)passive voice (~れる/~られる)
毎(まい)日(にち) mainichi大(たい)量(りょう) tairyouの no二(に)酸(さん)化(か)炭(たん)素(そ) nisankatansoが ga生(せい)成(せい) seiseiされている sareteiru。 Large amounts of carbon dioxide are being produced every day. Literal Every-day large-quantity [possessive-の] carbon-dioxide [subject-が] is-being-produced. 生成される is formal/technical — 生成 ('production/generation') + される (passive). 二酸化炭素 is the chemical term for CO₂: 二 (two) + 酸化 (oxide) + 炭素 (carbon). The sentence reads like a science text or news report. sciencetechnologyenvironment~ている (ongoing state)passive voice (~れる/~られる)