So the spread of agriculture could very well have a profound effect on the compositionof Earth's atmosphere.
所以农业的扩张很可能对地球大气的组成产生深远的影响。
2
The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical compositionof Earth'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。
3
They crunch Numbers that simulate the processes that drive Earth's climate, like incoming sunlight and the circulation and compositionof the ocean and atmosphere.