As the trail wound its way into Arizona's Sky Islands, the region's biodiversity was on full display, as were the threats from rising temperatures.
Green Matters on MSN
Arizona National Park adds small patch of land that could have big impact on desert ecosystem
On April 26, 1986, the Chernobyl Nuclear Reactor in northern Ukraine—then part of the Soviet Union—exploded, sending a ...
Farms and cities use so much of the Colorado River's water that little remains for the river's own ecosystem. Will ...
Whether you want to escape the cold weather or embrace it, there are lots of incredible U.S. destinations you can visit for a ...
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