There's been talk of running boats on cleaner natural gas, though we've yet to see this being implemented.

Not only that, they say, the plant would burn relatively clean natural gas and recycle its waste heat to make steam to heat buildings in Manhattan.

You don't get clean natural gas without a pipeline.

The production of ecologically clean synthetic gas is the standard goal.

El Paso needs cleaner gas for their air quality problems, and so we end up shipping gasoline across our aquifer.

We can use biology to make clean gas.

Far cleaner than coal or oil, it gas has been widely hailed - including by many environmentalists - as a miraculous game-changer.

The plant was built as a coal-fired power plant with four generating turbines but has since been converted to run on cleaner natural gas.

This country should be burning clean natural gas which contains no mercury whatsoever.

Britain got a similar boost when the Government abandoned protections for domestic coal producers, which sparked a rapid shift to cleaner natural gas.