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Ocean’s ability to absorb carbon is weakening as climate change intensifies, UN warns

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Briefings

A new UN report warns that the ocean's capacity to absorb carbon dioxide is weakening due to climate change. The report states that while the ocean absorbs 30% of human-caused CO2 emissions, climate change has already reduced this capacity by approximately 6% ahead of the upcoming COP31 conference in November.

Key points

• The ocean absorbs 30% of human-caused CO2 emissions.
• Climate change has reduced the ocean's carbon absorption capacity by approximately 6%.

Context

This finding is critical as it precedes the COP31 climate conference in November, where global leaders will discuss mitigation strategies. The reduction in absorption capacity poses a growing risk to global carbon budgets.

Limitations

The report provides a snapshot of current conditions at the time of publication in October 2026. It does not include future projections or long-term trends beyond the immediate impact on the 6% reduction.

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