Limits can be on (greenhouse gas emissions).Logical formLearned from14 sentences. (Tailpipe emissions) can be harmful.Logical formLearned from14 sentences. A national standard can be for (mercury emissions).Logical formLearned from14 sentences. Emissions can be from internal-combustion engines.Logical formLearned from14 sentences. Emissions may be cuted by some percent.Logical formLearned from14 sentences. (Gas emissions) may be tied to global warming.Logical formLearned from14 sentences. (Reduction targets) can be for (greenhouse gas emissions).Logical formLearned from14 sentences. Emissions may pertain-to a volcano.Logical formLearned from14 sentences. Emissions may double.Logical formLearned from14 sentences. (Greenhouse gas emissions) may be cuted.Logical formLearned from14 sentences. A lead can be in reducing (greenhouse gas emissions).Logical formLearned from14 sentences. Emissions can be in some countries.Logical formLearned from14 sentences. Targets can be for (cutting emissions).Logical formLearned from14 sentences. An approach can be to reducing emissions.Logical formLearned from14 sentences. (Vehicle emissions) can be harmful.Logical formLearned from13 sentences.