Which of the following has been changing most rapidly over the past 100 years?

Question

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Carbon dioxide levels have been increasing rapidly over the past 100 years due to human activities such as burning fossil fuels and deforestation. This increase in carbon dioxide is a major contributor to climate change. Oxygen levels have remained relatively stable, volcanic activity and meteorite collisions have not shown significant changes over the past 100 years, and glaciers have been retreating rather than advancing.

Which of the Following Has Been Changing Most Rapidly Over