Limits can be on (carbon emissions).Logical formLearned from12 sentences. Public discussion of (climate change) may be reduced to carbon.Logical formLearned from12 sentences. A dependence can be on carbon.Logical formLearned from12 sentences. A (carbon emission trading scheme) can be planned.Logical formLearned from12 sentences. Cent may pertain-to a (carbon dioxide).Logical formLearned from12 sentences. (Carbon nanotubes) can be strong.Logical formLearned from12 sentences. Layers can be constituted-of-or-filled-with (carbon nanotubes).Logical formLearned from12 sentences. (Carbon emissions) may grow.Logical formLearned from12 sentences. A (carbon emitter) can be in the world.Logical formLearned from12 sentences. A (carbon tax) can be on (carbon dioxide-spewing industries).Logical formLearned from12 sentences. A (carbon imprint) may pertain-to a person.Logical formLearned from12 sentences. A (carbon fiber alloy body) can be rugged.Logical formLearned from12 sentences. A (carbon fiber chassis) can be durable.Logical formLearned from12 sentences. Carbon can be hard.Logical formLearned from12 sentences. (Carbon offsets) can be enough.Logical formLearned from12 sentences.