In this Sept. 5, 2004 photo provided by Hassan Basagic is Lyell 

In this Sept. 5, 2004 photo provided by Hassan Basagic is Lyell Glacier in Yosemite National Park. In parts of California’s Sierra Nevada, the incursion of trees is sucking marshy meadows dry. Glaciers are melting into mere ice fields. Wildflowers are blooming earlier. And the optimal temperature zone for Giant Sequoias is predicted to rise several thousand feet higher, leaving existing trees at risk of dying over the next 100 years. As the climate warms, scientists studying one of the largest swaths of wilderness in the Continental U.S. are noting changes across national parks, national forests and 3.7 million acres of federally protected wilderness areas that are a living laboratory. (AP Photo/Hassan Basagic)
Associated Press
In this Sept. 5, 2004 photo provided by Hassan Basagic is Lyell Glacier in Yosemite National Park. In parts of California’s Sierra Nevada, the incursion of trees is sucking marshy meadows dry. Glaciers are melting into mere ice fields. Wildflowers are blooming earlier. And the optimal temperature zone for Giant Sequoias is predicted to rise several thousand feet higher, leaving existing trees at risk of dying over the next 100 years. As the climate warms, scientists studying one of the largest swaths of wilderness in the Continental U.S. are noting changes across national parks, national forests and 3.7 million acres of federally protected wilderness areas that are a living laboratory. (AP Photo/Hassan Basagic)
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