1.根据材料回答下列问题。(28分)材料一图1为青藏高原现代与末次盛冰期沙丘、沙地、黄土分布及40年来沙尘暴年发生日数。材料二随着全球气候变暖,特别是进入20世纪80年代以来的快速变暖,青藏高原冰川物质平衡持续呈负平衡,冰川呈全面、加速退缩状态,冰川末端在近几十年间出现了从快速退缩到加速退缩的过程。 1. According to the material to answer the following questions. (28 points) Materials Figure 1 shows the distribution of sand dunes, sandy loess and loess during the recent glacial maximum and the number of days of dust storms in the past 40 years in the Tibetan Plateau. Material II With the global warming, especially since the rapid warming since the 1980s, the material balance of the glaciers in the Tibetan Plateau continued to show a negative balance. The glaciers showed a complete and accelerated retreat. At the end of the glacier in recent decades, Quickly back down to accelerate the process of withdrawal.