When a SpaceX rocket failure set the skies aflame over western Europe last February, no-one was sure if the debris was also polluting our atmosphere.
The EPA produced the report after a 2007 US Supreme Court decision that it was responsible for regulating greenhouse gases under the Clean Air Act - with the court ruling it was "without a doubt" that these gases counted as air pollutants.
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@Peggy_：计算器在我手机中属于一个特殊的角色，它被扔在应用抽屉里面，不配占据桌面的一丝位置，但每当需要时它又能精准地回答我关于数字的一系列问题。通常来说，系统内置的计算器应用已经足以应付日常生活当中的加减乘除，我们可以看到几乎所有手机厂商都不会忽略这个工具性应用，仍在不断为其功能添砖加瓦。
self.writer = csv.DictWriter(