Earth’s poles »
Scientists Think They Know What’s Causing a Big Cloud of Methane Over the Southwest
For years, satellites have detected unusually high concentrations of the noxious gas in the Four Corners region. Methane is an extremely baleful greenhouse gas, with more than 20 times the pound-for-pound impact on global warming
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Mysterious Shining Space Clouds Are Becoming More Frequent
Rare night-shining clouds that glow across the edge of space tend to appear near Earth's poles. But since the turn of the century, these silvery clouds have become more frequent sights over lower latitudes,
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