Pollution may pertain-to the world.Logical formLearned from59 sentences. Pollution can be in a river.Logical formLearned from58 sentences. (Air pollution) can be from (power plants).Logical formLearned from58 sentences. An (air pollution) can be in a world-city.Logical formLearned from57 sentences. Mines may generate some percent of pollution.Logical formLearned from57 sentences. Areas can be constituted-of-or-filled-with pollution.Logical formLearned from57 sentences. A (water pollution) can be serious.Logical formLearned from57 sentences. An (air pollution) can be chronic.Logical formLearned from57 sentences. Pollution can be regional.Logical formLearned from57 sentences. Pollution can be from factories.Logical formLearned from56 sentences. Pollution can be in a (reporting system).Logical formLearned from56 sentences. An impact may pertain-to pollution.Logical formLearned from56 sentences. Fears can be constituted-of-or-filled-with pollution.Logical formLearned from56 sentences. A percent may pertain-to pollution.Logical formLearned from56 sentences. Pollution can be rampant.Logical formLearned from56 sentences.