A (carbon output) may pertain-to persons.Logical formLearned from19 sentences. (Carbon levels) can be in the atmosphere.Logical formLearned from19 sentences. (Carbon emissions) can be a cause of global warming.Logical formLearned from19 sentences. A (carbon footprint) may pertain-to a product.Logical formLearned from19 sentences. Higher levels can be constituted-of-or-filled-with (carbon monoxide).Logical formLearned from19 sentences. (Carbon dioxide emissions) may grow some percent.Logical formLearned from19 sentences. An isotope can be constituted-of-or-filled-with carbon.Logical formLearned from19 sentences. (Carbon dioxide levels) can be global.Logical formLearned from19 sentences. (Greenhouse gases) may include (carbon dioxide).Logical formLearned from19 sentences. A component may pertain-to a global (carbon cycle).Logical formLearned from19 sentences. A (carbon dioxide) can be sequestered.Logical formLearned from19 sentences. (Carbon nanotubes) can be sheets of (carbon atoms).Logical formLearned from19 sentences. Carbon may undergo an abundance.Logical formLearned from19 sentences. Arrays can be constituted-of-or-filled-with (carbon nanotubes).Logical formLearned from19 sentences. (Carbon sequestration) can be in soils.Logical formLearned from19 sentences.