Colombia declares emergency over raging forest fires

Colombia has declared a state of emergency in two regions as dozens of forest fires burned wide swathes of the country and left the capital choking on smoke during record temperatures linked with the El Niño weather phenomenon.

Permafrost: A ticking time bomb beneath our feet

Nearly a quarter of the Earth's land surface is permanently frozen. These areas, known as permafrost, are found in northern polar regions and at high altitudes. But the permafrost is now starting to thaw—with potentially ...

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