摘要
美国国家航空航天局（NASA）的卫星数据能显示全球变暖的最新迹象。新的数据指出，自2003年至今，格陵兰岛、南极和阿拉斯加地区的岸冰已经融化了两兆吨之多。
More than 2 trillion tons of land ice in Greenland,Antarctica and Alaska have melted since 2003, according to new NASA satellite data that show the latest signs of what scientists say is global warming.
