The retreat of Pedersen Glacier, Alaska
The retreat of Pedersen Glacier, Alaska. Left: summer 1917. Right: summer 2005. Image credit: 1917 photo captured by Louis H. Pedersen; 2005 photo taken by Bruce F. Molnia. From the Glacier Photograph Collection, National Snow and Ice Data Center/World Data Center for Glaciology.

Natural processes and human activities are constantly at work, altering the face of our planet. "State of Flux," a new image gallery on NASA's Global Climate Change Web site, uses imagery taken from the ground, air and space to paint some stunning portraits of change over time.

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