由于中国95%的电动自行车使用铅电池，一些研究结果显示，电动自行车向大气中排放的铅要高于其他类型的交通工具。

Because 95% of China's e-bikes use lead batteries, they emit more lead into the atmosphere than other forms of transportation, according to some studies.

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极光显现不同的颜色取决于大气原子的类型和其在天空中的高度。

Auroras glow in different colors based on the types of atoms in the atmosphere and how high they are in the sky.

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在他们的模型中，这些研究人员加倍关注大气中的二氧化碳量，并记录下有不同原因引起的变暖的多少和覆盖的地理类型。

In their model, the researchers doubled the concentration of atmospheric carbon dioxide and recorded the magnitude and geographic pattern of warming from different factors.

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