全球土壤的缓慢干涸：一场看不见的水危机正在地下蔓延
Some environmental crises announce themselves loudly, with floods or fires that fill the news. Others unfold in silence, invisible to all but the instruments that measure them. The gradual drying of the world's soils belongs firmly to the second kind, and it may prove no less consequential for being so quiet.
Across large stretches of southern South America, central North America, and parts of Africa and Asia, the moisture held within the ground has been declining for years. This is not the ordinary dryness of a single hot summer, but a deeper, slower trend, one that researchers increasingly link to a warming climate. As temperatures climb, the air grows thirstier, pulling water out of the land faster than rain can replace it.
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