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Trees and other plants help keep the planet cool, but rising levels of carbon dioxide in the atmosphere are turning down this global air conditioner.

林木和其他类植物可以维持星球适宜温度，但是大气中二氧化碳浓度的增加会减低这种调节作用。

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As to that mysterious star rising above the horizon, it turns out to be the planet Mars which is currently making one of its closest approaches to Earth.

至于那颗在地平线上升起的神秘的星星，原来是火星。现在正是火星最接近地球的时间之一。

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Occupying its outermost third is a convective zone where gas is rising and falling in planet-sized cells.

BBC: Sun, Trace

Countries on every corner of this Earth now recognize that energy supplies are growing scarcer, energy demands are growing larger, and rising energy use imperils the planet we will leave to future generations.

WHITEHOUSE: President Obama Pushes Clean Energy

With new technologies rising faster than sea level on a hot planet, America is headed for the biggest energy boom in 60 years.

FORBES: Fiscal Cliff? What We Really Need Is Another Stimulus