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Cracker Lake, Glacier National Park, Montana, USA.

Hike to Cracker Lake 11.2 miles round trip (with 1140 feet gain) beneath soaring peaks of the Lewis Range in Glacier National Park, Montana, USA. See the small and rapidly melting Siyeh Glacier clinging to the rock wall at the head of Cracker Lake. Of the 150 glaciers existing in Glacier NP in the mid 1800s, only 25 active glaciers remain as of 2010, and all may disappear as soon as 2020, say climate scientists. Glaciers carved spectacular U-shaped valleys and pyramidal peaks here as recently as the Last Glacial Maximum (the last "Ice Age" 25,000 to 13,000 years ago). An overwhelming consensus of world scientists agree that global warming is indeed happening and humans are contributing to it through emission of heat-trapping "greenhouse gases," primarily carbon dioxide (see www.ucsusa.org). Since the industrial revolution began, humans have increased atmospheric CO2 concentration by 35% (through burning of fossil fuels, deforesting land, and grazing livestock). Since 1932, Canada and USA have shared Waterton-Glacier International Peace Park, which UNESCO declared a World Heritage Site (1995) containing two Biosphere Reserves (1976). Rocks in the park are primarily sedimentary layers deposited in shallow seas over 1.6 billion to 800 million years ago. During the tectonic formation of the Rocky Mountains 170 million years ago, the Lewis Overthrust displaced these old rocks over newer Cretaceous age rocks.

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Montana: Glacier NP: Many Glacier hikes, Global warming, climate change
Hike to Cracker Lake 11.2 miles round trip (with 1140 feet gain) beneath soaring peaks of the Lewis Range in Glacier National Park, Montana, USA. See the small and rapidly melting Siyeh Glacier clinging to the rock wall at the head of Cracker Lake. Of the 150 glaciers existing in Glacier NP in the mid 1800s, only 25 active glaciers remain as of 2010, and all may disappear as soon as 2020, say climate scientists. Glaciers carved spectacular U-shaped valleys and pyramidal peaks here as recently as the Last Glacial Maximum (the last "Ice Age" 25,000 to 13,000 years ago). An overwhelming consensus of world scientists agree that global warming is indeed happening and humans are contributing to it through emission of heat-trapping "greenhouse gases," primarily carbon dioxide (see www.ucsusa.org). Since the industrial revolution began, humans have increased atmospheric CO2 concentration by 35% (through burning of fossil fuels, deforesting land, and grazing livestock). Since 1932, Canada and USA have shared Waterton-Glacier International Peace Park, which UNESCO declared a World Heritage Site (1995) containing two Biosphere Reserves (1976). Rocks in the park are primarily sedimentary layers deposited in shallow seas over 1.6 billion to 800 million years ago. During the tectonic formation of the Rocky Mountains 170 million years ago, the Lewis Overthrust displaced these old rocks over newer Cretaceous age rocks.
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