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natural gas risk factors
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natural gas risk factors, risks of natural gas, natural gas exposure risks, concerns of natural gas, natural gas health risks, natural gas environmental concerns, major problems with natural gas, problem with natural gas, natural gas risk analysis, dangers of natural gas, hazards of natural gas, two main hazards of natural gas, what is wrong with natural gas, what is the issue with natural gas, exposure to natural gas, what's wrong with natural gas, why is natural gas dangerous, why is natural gas bad