Aside from its unpleasant odor, the toxic gas-a natural byproduct of organic and inorganic wastes-can corrode metal.

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In 2005 he put mice into hibernationlike states with small doses of the toxic gas hydrogen sulfide.

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He hit on hydrogen sulfide as a potential knockout after watching a television program in 2002 about spelunkers who had to wear respirators when exploring caves filled with the toxic gas.

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British women have struggled to find an appropriate way out ever since toxic coal gas was phased out in the early 1970s.

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Reliance on coal, for example, contributes dramatically to increased asthma and respiratory diseases while fracking for natural gas contaminates local groundwater and vents toxic chemicals into the community air.

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Too much oxygen and the toxic ammonia in waste won't convert to nitrogen gas, which bubbles out.

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Faced with a potentially toxic mix of crippling public spending and decreasing oil and gas production, Algeria is looking for ways to expand their energy sector into new directions, including a substantial 20 year solar plan.

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Natural gas has other advantages over coal: It produces far fewer emissions of toxic chemicals and gases that contribute to climate change, key attributes as tougher environmental rules go into effect.

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Little by little, though, it becomes clear that these silent streets, brooding buildings and a giant, groaning gas works across the way are landmarks of his mind, where the toxic past coexists with the tormented present.

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The highly toxic H2S (hydrogen sulfide) and CO2 (carbon dioxide) are removed along with excess water to get the gas below 7 ppm (parts per million).

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