A (carbon market) can be voluntary.Logical formLearned from41 sentences. A (carbon monoxide) can be toxic.Logical formLearned from41 sentences. A (carbon dioxide emitter) may pertain-to the world.Logical formLearned from41 sentences. A (carbon cycle) can be terrestrial.Logical formLearned from41 sentences. A sink can be for carbon.Logical formLearned from41 sentences. Some percent can be constituted-of-or-filled-with (carbon dioxide).Logical formLearned from41 sentences. Emitters can be constituted-of-or-filled-with (carbon dioxide).Logical formLearned from41 sentences. (Carbon dioxide) may cause global warming.Logical formLearned from40 sentences. (Carbon panels) can be reinforced.Logical formLearned from40 sentences. An increase can be in (carbon dioxide emissions).Logical formLearned from39 sentences. A release can be constituted-of-or-filled-with (carbon dioxide).Logical formLearned from39 sentences. Carbon can be solid.Logical formLearned from39 sentences. A mixture can be constituted-of-or-filled-with (carbon dioxide).Logical formLearned from39 sentences. A (carbon tax) can be controversial.Logical formLearned from39 sentences. Caps can be on (carbon dioxide emissions).Logical formLearned from39 sentences.