A (river pollution disaster) can be in a decade.Logical formLearned from5 sentences. A (river pollution disaster) may pertain-to a continent.Logical formLearned from5 sentences. Pollution may warm.Logical formLearned from5 sentences. Progress can be in clean_upping pollution.Logical formLearned from5 sentences. Pollution can be in waterways.Logical formLearned from5 sentences. Industrial pollution can be in a continent.Logical formLearned from5 sentences. Pollution can be times.Logical formLearned from5 sentences. Pollution can be dangerous.Logical formLearned from5 sentences. An animal may be suspected of causing pollution.Logical formLearned from5 sentences. Legislation can be on (aircraft noise pollution levels).Logical formLearned from5 sentences. A (climate treaty) may curb (greenhouse gas pollution).Logical formLearned from5 sentences. A world-city may have an (air pollution problem).Logical formLearned from5 sentences. A combination of temperatures may push (air pollution levels).Logical formLearned from5 sentences. (Air pollution levels) may hit a point.Logical formLearned from5 sentences. A (government body) may monitor (air pollution).Logical formLearned from5 sentences.