Farms and cities use so much of the Colorado River's water that little remains for the river's own ecosystem. Will negotiators save what's left?
U.S. winter getaways can be a risky business for sun-seekers, with many parts of the country prone to deep freezes and ...
North America’s favorite songbirds rely heavily on five tropical forests for wintering habitat and safe passage during ...
Hamilton, the zoologist who dedicated his life to saving Africa’s elephants from systematic slaughter—despite being nearly ...
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