It is the first time researchers have drawn a direct link between a known piece of space debris crashing to Earth and pollution levels.
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But questions remain about how realistic the goal and timeframe are, given recent and steep Nasa budget cuts, and some scientists are concerned that the plans are driven by geopolitical goals.，详情可参考WPS下载最新地址
She started after her brother Peter died from a brain tumour in 1989 when he was just 24.
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Government sources have told BBC News that ministers are interested in delaying that rise, though are unlikely to reverse the commitment entirely.