Uncontrolled subsurface gas migration and emission poses a number of risks to the environment and human health & safety from anthropogenic sources such as:-
- landfill waste
- abandoned coal mining
- shale gas production
- contaminated land from past industrial use (some dating as far back as Victorian times)
- pipeline leaks from current industrial processes such as oil refining & chemical manufacture
- Coal bed methane
And depending on the type of gas present, there is the potential for:-
- an explosion
- acute health effects e.g. headaches, dizziness, unconsciousness or even asphyxiation and death
- chronic, long term health effects e.g. cancers.
- Global warming
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