Carbon Budget and Global Climate Change · NCERT Biology

Which factor reduces the efficiency of oceans as carbon sinks?

  1. Lower ocean temperatures
  2. Increased phytoplankton growth and productivity
  3. Ocean warming
  4. Deep-water upwelling currents
Show answer and explanation

Correct answer: Ocean warming

Warmer oceans hold less dissolved CO2. This reduces their capacity to absorb atmospheric carbon.

Difficulty: Medium Question 17 of 20

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