Computer Science · May / June 2025 · Paper 2 TZ3 SL · Question 5

5. The global increase in mean temperatures is causing concern, and governments are using computer models to determine potential future changes. Many islands in the Pacific Ocean are close to or below sea level and have observed an increased incidence of coastal flooding. This suggests there is a relationship between the increase in mean temperatures and the increase in mean sea levels. Figure 4 shows the mean sea level of Nauru from 1994 to 2015. Figure 4: Mean sea level of Nauru, 1994–2015 1993 1997 2001 2005 2009 2013 −0.4 −0.3 −0.2 −0.1 0 0.1 0.2 0.3 0.4 Sea level (metres) Year If the mean sea level rises, the probability of coastal flooding will also increase. This will put many of the inhabitants of Nauru at risk. It has been proposed that a simulation be developed to show the effects of rising temperatures on the extent and frequency of coastal flooding.

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