Event 68

Interior Alaska
Permafrost thawing is causing the ground to subside 16-33 ft (4.9-10 m) in parts of interior Alaska. The permafrost surface has warmed by about 3.5°F (1.9°C) since the 1960's.

Photo: Dr. Tom Osterkamp at one of his permafrost measuring sites in Alaska.

Event 10: Heat wave.
Event 20: Frogs spawning early.
Event 21: Birds laying eggs early.
Event 22: Early leafing of trees.
Event 28: Butterfly range shift.
Event 31: Alpine meadow changes.
Event 32: Penguin decline.
Event 33: Sea bird decline.
Event 35: Shoreline sea life shifting.
Event 36: Disappearing toads.
Event 65: Retreating Glaciers.
Event 68: Permafrost thawing.
Event 69: Snow-cover decrease.
Event 70: Warming of Antarctica.
Event 109: Decrease in hibernation.
Event 117: Antarctic plants change.
Event 137: Thinning of ice sheet.

Gary Braasch, who documents climate change through photography, provided us with these photographs. Many more examples of his work can be found on his web site, World View of Global Warming, http://www.worldviewofglobalwarming.org.

The following organizations produced GLOBAL WARMING: Early Warning Signs:
Environmental Defense Natural Resources Defense Council Sierra Club Union of Concerned Scientists	U.S. Public Interest Research Group World Resources Institute World Wildlife Fund
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