11.   They remove dead timber, they are wonderful architects, and they generate methane gas, which contributes to the greenhouse effect.

12.   Methane gas does collect in the mines around here.

13.   The ignition of methane gas killed eight men.

14.   The blasts were caused by pockets of methane gas that ignited.

15.   Another example is the use of both urban and agricultural wastes to produce methane gas under controlled fermentation.

16.   The methane gas produced is used for heating and generating power for the farm buildings.

17.   Methane gas is regarded as a harmless byproduct of fermentation in the large intestine of man.

18.   It is needed to burn off methane gas, which has been discovered seeping off a disused council tip.

19.   METHANE gas escaping from a refuse site in Renfrewshire could threaten hundreds of homes, Renfrew District Council was told yesterday.

20.   Apparently, the playground is built on a dump that is still leaking methane gas.