| 1 | The manipulation of gas supplies has become a weapon in this contest. | |
| 2 | Meanwhile, a recent drop in natural gas prices has prompted many utilities to replace aging coal plants with gas-fired generation. | |
| 3 | A gas leak aboard a sealed bus could cause a major fire if it grew dense enough and was ignited by a spark. | |
| 4 | Piezoelectric crystals produce an electric current when bent and have many uses - the igniter on a gas barbecue grill being one of them. | |
| 5 | Although no commercial plants are yet in operation the US, UK and EU Commission are planning to fund both coal and gas plants demonstrating the technology. |
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