2015年8月21日Enn环境新闻网美国国家航空航天局(NASA)一份最新的报告数据显示,在连续遭遇4年干旱之后,加州中央谷地的大片土地下沉速度比过去更快了。过去八个月,部分地面下陷甚至超过了30厘米,中央谷地的一些地面每个月以近2英寸的速度之多持续下沉。但凡遭遇历史性大旱,加州居民和农民都会取用地下水,这也是导致地面下沉的主要原因,再加上加州是全美首屈一指的农业大州,但连续的干旱使得加州今年无法投入 August 21, 2015 Enn Environment News According to a new NASA report, after four consecutive years of drought, large areas of land in the Central Valley of the California sunk faster than ever before. In the past eight months, parts of the ground subsided even more than 30 cm. Some of the ground in the Central Valley continued to sink every month at nearly 2 inches. However, in the event of a historic drought, both California residents and peasants have access to groundwater, which is also a major cause of ground subsidence. Coupled with California’s status as a leading agricultural country in the nation, successive droughts have left California unable to invest this year