Earth’s oceans are probably hotter than at any point in at least 1,000 years and are warming faster than they have for millennia. A 2026 review adds another warning: dissolved oxygen is rapidly declining across oceans, lakes and rivers, and although no formal planetary boundary has yet been defined, researchers argue that current losses may already exceed what can reasonably be considered safe.
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Water does not need to boil, turn acidic or fill with plastic before it becomes hostile to life. It can simply become harder to breathe.
That is happening across parts of the ocean and in lakes, rivers, estuaries and streams. A 2026 review in Limnology and Oceanography argues that the decline of dissolved oxygen now belongs in the conversation about Earth’s planetary boundaries: the large processes that help keep the planet within a relatively stable operating range.
The paper does not define a
That is happening across parts of the ocean and in lakes, rivers, estuaries and streams. A 2026 review in Limnology and Oceanography argues that the decline of dissolved oxygen now belongs in the conversation about Earth’s planetary boundaries: the large processes that help keep the planet within a relatively stable operating range.
The paper does not define a
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