1.   Gas was used in houses and for street lights from the early nineteenth century.

2.   It is the biggest single concept, many others being devoted to using methane gas at waste product dumps.

3.   Smaller cars use less gas.

4.   That plant uses methane gas from the landfill to generate electricity.

5.   The cleaned and cooled gas can be used in diesel or petrol engines.

6.   The gas is used for domestic heating and cooking.

7.   The system uses gas instead of water, which can extinguish fires without damage to customer equipment.

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