Carbon can be brown.Logical formLearned from21 sentences. A (carbon footprint) may pertain-to a nation.Logical formLearned from21 sentences. Stores can be constituted-of-or-filled-with carbon.Logical formLearned from21 sentences. Traces can be constituted-of-or-filled-with (carbon monoxide).Logical formLearned from21 sentences. A store can be constituted-of-or-filled-with carbon.Logical formLearned from21 sentences. An atmospheric (carbon dioxide) can be elevated.Logical formLearned from21 sentences. An activated carbon can be granulated.Logical formLearned from21 sentences. Carbon can be granular.Logical formLearned from21 sentences. (Carbon nanotubes) may undergo a discovery.Logical formLearned from21 sentences. A cap can be on (carbon dioxide).Logical formLearned from21 sentences. A (carbon flux) can be organic.Logical formLearned from21 sentences. Carbon may undergo a fate.Logical formLearned from21 sentences. A (carbon dioxide) may pertain-to a country.Logical formLearned from21 sentences. (Carbon dioxide emissions) may cause global warming.Logical formLearned from21 sentences. (Carbon dioxide) can be into the atmosphere.Logical formLearned from21 sentences.