Engines may undergo emissions.Logical formLearned from19 sentences. Targets can be on emissions.Logical formLearned from19 sentences. (Emission standards) can be tough.Logical formLearned from19 sentences. (Vehicle emissions) can be constituted-of-or-filled-with (greenhouse gases).Logical formLearned from19 sentences. (Greenhouse gas emissions) may be compared to some (emission levels).Logical formLearned from19 sentences. Some percent can be constituted-of-or-filled-with (mercury emissions).Logical formLearned from19 sentences. Cutbacks can be in (greenhouse gas emissions).Logical formLearned from19 sentences. Emissions may pertain-to a country.Logical formLearned from19 sentences. Emissions can be by nations.Logical formLearned from19 sentences. Vehicles may undergo emissions.Logical formLearned from19 sentences. (Gas emissions) may pertain-to a country.Logical formLearned from19 sentences. Emissions may pertain-to today.Logical formLearned from19 sentences. Emissions can be to output.Logical formLearned from19 sentences. Emissions can be illegal.Logical formLearned from18 sentences. (Carbon dioxide emissions) may contribute to global warming.Logical formLearned from18 sentences.