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The Arctic is warming faster than anywhere on Earth, and clouds may be key. Photographs by Esther Horvath capture an extreme scientific mission.
The restoration of the Sonoma Creek in the San Francisco Bay Area not only corrects problems of the past, but also looks to the future.
Homebound by illness and grief, Ada Clapham Govan found healing and a new direction by observing her backyard birds.
Human development has caused the bird's gene pool to shrink. An ambitious experiment to relocate scrub-jay families could bring reprieve, while also pointing the way to preserving other threatened species.
New recovery techniques have helped the iconic waterbirds nest in the state's glacial lakes for the first time in more than a century.
An effort to restore the region's historic woodlands is showing signs of success. Now conservationists hope to reestablish the long-gone songbirds.
A new decision by an Atlantic Coast fishing regulator may put coastal birds like Ospreys at risk of not having enough to eat.
Advocates have long fended off proposals that would deplete Arizona's San Pedro River, but today's threats add up to a daunting challenge.