It was thought the water would freeze in the depths of the ice.

过去人们认为这些水会在冰川底部冻结
On the contrary, it flows under the ice,

相反的这些水会在冰川底部流动
Carrying the ice sheet into the sea,

带着冰川流向大海
Where it breaks into icebergs.

在那里冰川会破裂成冰山
As the fresh water of greenland's ice sheet...

随着格陵兰岛冰面的淡水
Gradually seeps into the salt water of the oceans,

流入海洋的盐水中
Low-lying lands around the globe are threatened.

地球上地势较低的地方会面临威胁
Sea levels are rising.

海平面上升
Water expanding as it gets warmer

随着气候变暖水量增加
caused, in the 20th century alone, a rise of 20 centimeters.

单单在20世纪海平面就上升了20厘米
Everything becomes unstable.

所有的东西都变得不稳定
Coral reefs, for example, are extremely sensitive...

例如珊瑚礁