Semester 1 of Academic Year 2011-12 » 2011学年的1学期 changed earth » 改变了的地球 tony suggest joyce.
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我们实际上改变了地球大气层的化学成分。
We have literally altered the chemistry of our planet's atmosphere.
这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
随着气候的变化以及土壤沙漠化，人类从根本上改变了地球的表面。
With climate change, concrete deserts and agriculture, human beings have fundamentally altered the face of the Earth.
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