Scientists are very concerned about the changes in concentration of carbon dioxide in the Earth’s atmosphere. The graph below shows the concentration of carbon dioxide in the atmosphere between 1988 and 2014. Describe two patterns shown in the graph above. – 7087

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1. The overall concentration of carbon dioxide (CO₂) increases over time — for example, it goes up by about 54 units (or from 364 to 418). The graph shows repeating patterns with peaks and troughs, which means the CO₂ levels rise and fall regularly.
   Each of these cycles lasts 1 year, and the change within a cycle is usually between 8 and 16 units.

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