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Environmental Woes of Tierra del Fuego -- Climate Change

Dr. Rolf Killian shouts a sonar depth to Dr. Gino Casassa as they cruise the waters of Lago Grey, a lake at the end of the Grey Glacier. Casassa studies the bottom of the lake, looking for "pinning points," or high ridges that may help hold the glacier in place despite warmer temperatures. Without a pinning point, the ice of the glacier floats on water, speeding the melt rate to a degree that seems alarming.

"I think the warming signal — in Chile, at least — to my mind it's largely natural," Casassa says. "However, the higher frequencies of the El Niño/La Niña effect and some other changing climate patterns observed in recent years could be linked to such things as the greenhouse effect. And this, of course, needs to be studied."

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11GreySonar.jpg
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© Kevin Moloney, 2000
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4605x3022 / 4.6MB
Contained in galleries
1. Climate Change
Dr. Rolf Killian shouts a sonar depth to Dr. Gino Casassa as they cruise the waters of Lago Grey, a lake at the end of the Grey Glacier. Casassa studies the bottom of the lake, looking for "pinning points," or high ridges that may help hold the glacier in place despite warmer temperatures. Without a pinning point, the ice of the glacier floats on water, speeding the melt rate to a degree that seems alarming.<br /> <br /> "I think the warming signal — in Chile, at least — to my mind it's largely natural," Casassa says. "However, the higher frequencies of the El Niño/La Niña effect and some other changing climate patterns observed in recent years could be linked to such things as the greenhouse effect. And this, of course, needs to be studied."