Carbon can be ionized.Logical formLearned from21 sentences. (Carbon nanotubes) may undergo a synthesis.Logical formLearned from21 sentences. A tax can be on (carbon dioxide emissions).Logical formLearned from21 sentences. (Carbon dioxide) may undergo a formation.Logical formLearned from21 sentences. Fluxes can be constituted-of-or-filled-with carbon.Logical formLearned from21 sentences. (Carbon sinks) can be terrestrial.Logical formLearned from21 sentences. Developing nations may produce an output of (carbon dioxide).Logical formLearned from21 sentences. Carbon can be powdered.Logical formLearned from21 sentences. A year may suppress an amount of (carbon dioxide).Logical formLearned from21 sentences. (Carbon footprints) can be personal.Logical formLearned from21 sentences. Sale can be in carbon.Logical formLearned from21 sentences. (Carbon dioxide emissions) can be from new cars.Logical formLearned from21 sentences. A plane may be built from (carbon fiber).Logical formLearned from21 sentences. A (carbon trading scheme) may pertain-to a government.Logical formLearned from21 sentences. (Carbon emissions) can be from fossil fuels.Logical formLearned from21 sentences.