Pollution may be reduced.Logical formLearned from63 sentences. Pollution can be illegal.Logical formLearned from63 sentences. Rivers may undergo pollution.Logical formLearned from63 sentences. (Pollution reductions) can be mandatory.Logical formLearned from63 sentences. Potential can be for pollution.Logical formLearned from63 sentences. Pollution may increase.Logical formLearned from62 sentences. (Water pollution) may undergo a prevention.Logical formLearned from62 sentences. Effects can be constituted-of-or-filled-with pollution.Logical formLearned from61 sentences. Pollution can be in air.Logical formLearned from61 sentences. Limits can be on pollution.Logical formLearned from61 sentences. An increase can be in pollution.Logical formLearned from60 sentences. Streams may undergo pollution.Logical formLearned from60 sentences. A lake may undergo pollution.Logical formLearned from60 sentences. Pollution may cause global warming.Logical formLearned from59 sentences. A (pollution problem) can be serious.Logical formLearned from59 sentences.