The earth may undergo pollution.Logical formLearned from17 sentences. Studies can be constituted-of-or-filled-with pollution.Logical formLearned from17 sentences. An environmental pollution can be global.Logical formLearned from17 sentences. (Air pollution) can be in a community.Logical formLearned from17 sentences. Respect can be to (air pollution).Logical formLearned from17 sentences. An approach can be to (pollution prevention).Logical formLearned from17 sentences. Concerns can be about (water pollution).Logical formLearned from17 sentences. (Pollution laws) may pertain-to a us-state.Logical formLearned from17 sentences. The world may undergo pollution.Logical formLearned from17 sentences. Pollution can be low-level.Logical formLearned from17 sentences. Pollution can be severe.Logical formLearned from17 sentences. A (pollution problem) may pertain-to a city.Logical formLearned from17 sentences. (Pollution levels) can be in a river.Logical formLearned from17 sentences. Contributions can be to (air pollution).Logical formLearned from17 sentences. Scientists may study (arsenic pollution).Logical formLearned from17 sentences.