Lichens can be sensitive to (air pollution).Logical formLearned from4 sentences. A world-city may have (pollution problems).Logical formLearned from4 sentences. Pollution may pass.Logical formLearned from4 sentences. Trade may undergo a (pollution content).Logical formLearned from4 sentences. Recyclings may reduce pollution.Logical formLearned from4 sentences. (Pollution controls) can be efficient.Logical formLearned from4 sentences. Deep cuts can be in pollution.Logical formLearned from4 sentences. Pollution can be into air.Logical formLearned from4 sentences. Pollution may be caused by oil.Logical formLearned from4 sentences. Youth may investigate (pollution issues).Logical formLearned from4 sentences. Pollution may arise.Logical formLearned from4 sentences. Corporations may pay for pollution.Logical formLearned from4 sentences. A record can be constituted-of-or-filled-with pollution.Logical formLearned from4 sentences. Pollution may undergo an introduction.Logical formLearned from4 sentences. (Pollution control measures) may undergo an implementation.Logical formLearned from4 sentences.