科學家警告海洋與河流中的氧氣含量正在下降
Scientists warn of declining oxygen levels in oceans and rivers
Updated at: July 21, 2026 at 01:45 AM
一場靜悄悄的危機正在我們的水域下蔓延。
A quiet crisis is unfolding beneath the surface of our waters.
這被稱為水體脫氧作用，海洋、河流和湖泊中溶氧量的下降已成為嚴重的環境威脅。
Known as aquatic deoxygenation, the decline of dissolved oxygen levels in oceans, rivers, and lakes has become a critical environmental threat.
自1960年以來，海洋已損失約2%的氧氣，而一些湖泊的降幅則高達18%。
Since 1960, oceans have lost roughly 2% of their oxygen, while some lakes have seen declines as high as 18%.
兩個主要因素導致了這場災難：全球暖化與營養鹽污染。
Two main factors drive this disaster: global warming and nutrient pollution.
氣溫上升導致水體滯氧能力下降，並阻礙了自然的垂直混合，而農業徑流則引發了大量藻類水華，這些藻類在分解時會消耗氧氣。
Rising temperatures cause water to hold less oxygen and prevent natural mixing, while agricultural runoff triggers massive algal blooms that consume oxygen as they decompose.
隨著氧氣水平下降，生物多樣性受到衝擊。
As oxygen levels drop, biodiversity suffers.
魚類被擠壓到更小的棲息地，變得更加脆弱，而有毒細菌的擴張則威脅著生態系統與糧食供應。
Fish are squeezed into smaller habitats, making them vulnerable, while the expansion of toxic bacteria threatens ecosystems and food supplies.
科學家現正敦促國際社會將脫氧作用列為第10項「地球限度」(Planetary Boundary)，正式承認其作為全球危機的地位。
Scientists now urge the international community to label deoxygenation as a 10th 'Planetary Boundary,' a formal recognition of its status as a global danger.
