Looking ahead, the gas unit will continue to be the main earnings driver given its stable income flow and bigger base.

展望未来，燃气项目料继续成为盈利原动力因有稳定现金流及基数较大。

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Gas emits about half as much carbon dioxide as coal per unit of energy produced.

天然气的二氧化碳产生量是每单位煤炭释放能量时二氧化碳产生量的一半。

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Howarth and his colleagues conclude that the greenhouse gas footprint of shale gas can be as much as 20 percent greater than, and perhaps twice as high as, coal per unit of energy.

霍沃斯和他的同事综合这些因素认为页岩气的温室气体足迹比每单位能煤炭要高20%甚至高出一倍。

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Bob Richard, executive vice president for gas operations of the company's DTE Gas unit, said the problem is being rectified now.

WSJ: Report: Michigan a leader in outdated gas lines

"Manx Gas is paying about 20% more today per unit of gas than we were a year ago and against that we are only increasing our prices for natural gas by 5.5%, " said Mr Nicholls.

BBC: Gas ring

Also, burning wood releases three times more carbon into the atmosphere than burning natural gas, per unit energy generated, said Booth.

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