At the heart of our changing climate is a paradox. While the air blanket near the earth's surface warms, most of the atmosphere above the earth cools dramatically. The same gases that heat the lower few kilometers of air cool the much larger spaces above that, which reach to the edge of space. This paradox was predicted long ago by climate modelers, but only recently has it been quantified in detail by satellite sensors. The new findings provide definitive confirmation of one important question, but also raise other questions. (FRED PEARCE)

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