The assessment was based on different production technologies of the natural gas-based DME and coal-based DME and combined with vehicle data.

评估中，根据了煤基和天然气基二甲醚的不同生产工艺，结合了车辆数据。

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The oil giant made a big bet on the domestic natural gas market late last year buying Texas-based XTO Energy for billion.

这家石油巨头去年看好国内天然气市场，于年底以410亿美元收购了德克萨斯州的XTO能源公司。

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But the cleanliness of natural gas is largely based on its lower carbon dioxide emissions when burned.

但是天然气的清洁特性主要是基于其在燃烧时较低的二氧化碳排放量。

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While these had dropped to record lows, sparking a boom in natural gas-based electricity production, coal demand fell.

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Crestwood, the Houston-based company engaged in gathering and processing natural gas, announced an all-stock merger with Inergy, the Kansas City, Missouri-based company engaged in storage and transportation of natural gas earlier this month.

FORBES: Energy MLPs acquire so they can borrow cheaply... and do more deals

Michael Harris was a geologist in Rio de Janeiro for Devon Energy, a U.S.-based natural gas and oil producer, according to a company spokesman.

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