Hydrogen is a kind of high efficient, clean energy source.

氢能是一种新型高效洁净能源。

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The new clean energy source-hydrogen energy is highlighted in research.

新型洁净能源—氢能是新能源的研究热点。

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Natural gas is a clean energy source with increasing demand in the worldwide.

天然气作为一种清洁环保的能源，需求量越来越大。

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If there is a cheap and clean energy source out there, odds are someone--looking in the right place--will find it.

FORBES: America's Best Places For Alternative Energy

And it underscores the crucial need to utilize an abundance of dirty coal in China and Mongolia as a clean energy source for the fastest growing economy in the world.

FORBES: Synthesis Energy Systems Will Turn China's Dirty Coal Into Clean Natural Gas

President Barack Obama has strongly endorsed natural gas as a clean energy source, and New York Mayor Michael Bloomberg has said more natural gas is critical for the city to improve air quality and public health.

WSJ: NY town of 9/11 workers wages gas pipeline fight