As the world's top energy consumers, energy producers and greenhouse gas emitters, the United States and China play central roles in the world's ongoing transition to a clean-energy economy.

作为世界上最大的两个能源消费国、能源生产国和温室气体排放国，美国与中国在世界向清洁能源经济过渡的进程中将发挥核心作用。

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There is a more mundane derivative noted by Merriam-Webster: sublimate, which is the transition directly from solid to gas.

韦氏词典使用了更为现实的衍生意：升华，从固体到气体的直接转换。

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When the car's 16-kilowatt-hour battery pack becomes depleted, the car automatically switches to a gas engine-a transition that is remarkably smooth (it's nearly impossible to discern on the road).

当这一车型的16千瓦时的电池组用尽时，它会自动切换到燃气发动机——这一转换过程非常平滑(在行驶中几乎无法察觉)。

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While the plunge was more abrupt with Patriot, comparable coal credits have also seen sharp declines amid historically low natural gas prices and a regulatory environment that is pushing a coal-to-gas transition.

FORBES: Coal credits pressured by regulatory issues, coal-to-gas transitions

For gas prices to get this high on a sustained basis, you have to assume that either (a) shale gas will prove a colossal, over-hyped, mega-bust (something the Right is most definitely not in the usual business of positing) or (b) the U.S. auto-fleet will quickly transition to natural gas powered engines, driving up the demand for natural gas and, thus, the price.

FORBES: President Obama's Alleged "War On Coal" - Climate Change Edition

If that hope comes true, the transition from coal to gas will generate a huge burst of economic activity and accelerate the transition to a more sustainable future for humanity.

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