Northern Gas Networks said it was replacing ageing metal gas mains with plastic equivalents to "reduce gas leakage and enhance network reliability".

BBC: Generic water works

CO2 life-cycle emissions for natural gas are higher than coal after taking into account leakage during transport through old Russian pipelines.

ECONOMIST: Change of environment

If the gas pressure is reduced, it is a clear sign that leakage is occurring.

FORBES: Pipeline Explosion Rattles Natural Gas Industry

The unabsorbed fat leads to gas, flatulence, diarrhea, increased bowel movements, and even, how to put this delicately, anal leakage of oily material.

NPR: Slate's Medical Examiner: Xenical OTC