In the vacuum of space, the amount of debris—spent rocket stages, splintered satellites, micrometeoroids—numbers in the millions, all zooming about, often at 17,000 mph speeds. They’re also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn’t completely clean.
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The owner of Drax power plant has started reducing the amount of Canadian wood pellets it burns, and will stop burning trees from British Columbia entirely within the next year.，更多细节参见WPS官方版本下载
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