Growing concentrations of carbon dioxide (CO2) in the Earth’s upper atmosphere from human activities can be expected to induce a gradual contraction of the thermosphere, a change that will lower the drag on satellites but also diminish a natural destructive force for the re-entry of man-made orbital debris, according to a new study. The study from a U.S. and Canadian science team led by the Naval Research Laboratory offers the first direct evidence that CO2 emissions from human activity ...

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