Sierra Nevada snowpack hits highest level in nearly 30 years

The statewide Sierra Nevada snowpack—the source of nearly one-third of California's water supply—is at its highest level since 1995, boosting hopes that an end to the drought is near, but also raising concerns that a ...

Why don't rivers straighten out over time?

Seen from above, the world's greatest rivers can be recognized by their serpentine curves. But how do these shapes form, do they alter over time and does this matter? We turned to our river system expert, Carmelo Juez.

Warming world creates hazard for Alpine glaciers

Italy was enduring a prolonged heat wave before a massive piece of Alpine glacier broke off and killed hikers on Sunday and experts say climate change will make those hot, destabilizing conditions more common.

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