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托福阅读材料推荐:冰川正在融化

2016-07-18 16:06:41来源：网络

　　本文是【National Geographic】Photo Evidence: Glacier National Park Is Melting Away. All the glaciers are shrinking.。托福阅读材料推荐:冰川正在融化，希望对大家托福备考有所帮助。更多精彩尽请关注新东方在线托福网!

　　Photo Evidence: Glacier National Park Is Melting Away

　　Oct. 21, 2015 - Glacier National Park is losing its iconic glaciers to a changing climate. In the mid-1800s, this Montana landscape was covered by 150 glaciers—today only 25 remain. To show the decrease in glacier size, scientists from the USGS Northern Rocky Mountain Science Center photograph the same areas where glaciers were photographed in the early 1900s. Dan Fagre, a USGS research ecologist, has been studying climate change in the park for more than 20 years. Fagre and his colleagues discuss what melting glaciers and climate change mean for the future of the park, which is expected to be nearly glacier free by 2030, based on present warming trends.

　　Transcript

　　Dan Fagre

　　USGS Research Ecologist

　　All the glaciers are shrinking.

　　In the 1800s there were estimated to be about 150 glaciers here, however today we only have 25 glaciers.

　　The glaciers are measured by a number of different ways, one of the most obvious ones is using repeat photography, where we go and occupy a site from which a photographer took a picture from say in 1910, and then we re-photograph that from exactly the same spot.

　　Once you go every several years to five years or 10 years, that's when you see the really big changes.

　　When we first started this project we thought every other year was gonna be too much, but recently we've seen so much glacier change that now we are increasing our frequency, repeating photographs or visiting glaciers.

　　You can see that it's all melted away, the lake has gotten bigger, all this ice is contributed to the water and is retreating back up towards the head wall of the mountain.

　　We also do things that are a little bit more modern such as taking global positioning systems and going along ht margins of the ice so that we can look at the changes in the area of the ice through time.

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