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目前,世界上有许多沿海城市地面正在逐渐下沉。如墨西哥城每年下沉5至10毫米。意大利的威尼斯在近百年中悄悄地下沉,现城市高度只剩海拔一米来高。 究竟是什么原因导致陆地下沉呢?经科学家研究调查,原因是地球变暖导致海平面上升。近百年来,全球气候在波动的进程中趋于变暖,这种趋势并不是一种自然变化,而是因为大气中二氧化碳浓度升高和其它人为气体的积聚引起的。二氧化碳浓度升高的主要原因是大量矿物燃料燃烧所
At present, there are many coastal cities in the world where the ground is gradually sinking. Mexico City, for example, sinks 5 to 10 millimeters annually. Venice in Italy quietly sink in the past century, the height of the city now only 1 meter above sea level. What exactly led to the sinking of the land? Investigated by scientists, the reason is that warming the Earth leads to sea level rise. Over the past century, the global climate has become warmer in the process of fluctuations. This trend is not a natural change but due to the increase of atmospheric carbon dioxide and the accumulation of other man-made gases. The main reason for the increase in carbon dioxide concentration is the burning of fossil fuels