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Gas leakage in the industry is a very big concern that is just now becoming known to the public,
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…the amount of leakage is of a scale that any 'green' designation of gas use,
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 ...is in danger of becoming over-ridden by how leaky the industry is.

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Natural gas drilling only has environmental benefits over other processes like coal and oil production,
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...if producers can keep a tight lid on leaks

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https://www.theguardian.com/environment/2015/jun/24/natural-gas-leaks-methane-environment
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Leaks and releases occur throughout the natural gas supply chain
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https://www.edf.org/energy/methaneleakage
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Methane Leaks from Oil and Gas Wells Now Top Polluters
The oil and gas industry surges past cows as top U.S. methane emitter
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https://www.scientificamerican.com/article/methane-leaks-from-oil-and-gas-wells-now-top-polluters/
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