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      Question

      According to the WMO, by how much did CO2 concentrations

      increase over the last 20 years to reach 420 ppm in 2023?
      A 8.5% Correct Answer Incorrect Answer
      B 10.2% Correct Answer Incorrect Answer
      C 11.4% Correct Answer Incorrect Answer
      D 12.7% Correct Answer Incorrect Answer
      E 15.0% Correct Answer Incorrect Answer

      Solution

      The WMO reported an 11.4% increase in CO2 levels over the past 20 years, driven by fossil fuel combustion and vegetation fires, contributing to the record concentration of 420 ppm in 2023.

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