The problem is exacerbated by the lack of an adequate replacement for a pair of Earth-observation satellites, the Orbiting Carbon Observatory and Glory, which failed on launch in the past two years.

在过去两年Glory观测卫星失败发射，所以无法提供备用的地球观测卫星，这进一步加重了该问题。

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At the moment, the earth-observation satellites which employ microwaves generally use short-wavelength radiation, because this provides more detailed images.

ECONOMIST: Archaeology: What lies beneath | The