IB ESS SL 6.2 Climate Change Causes and Impacts Topic Practice

51 %-60 %;

larger population uses more energy/fossil fuels, so produces extra carbon dioxide/greenhouse gases;
larger population uses more land for growing food eg rice / keeps more livestock, so produces extra methane/greenhouse gases;
more people results in more respiration increasing $\mathrm{CO}_{2}$ and contributing to global warming

Marking guidance:

Accept other reasonable suggestions.

a. Rising temperatures may cause cloud layer to occur at higher elevation (causing biome shift);
b. Higher temperatures may lead to death of organisms/decrease in growth (as they are pushed beyond their limits of tolerance) / Increased global temperature may increase evapotranspiration in cloud forest leading to stress/death of plants;
c. Higher temperatures/reduced precipitation/droughts which may increase risk of forest fires;
d. Higher temperatures/higher precipitation may result in higher plant growth/primary productivity;
e. Drought/reduction in precipitation may reduce plant/tree growth/primary productivity (due to reduction in water availability);
f. Higher precipitation may result in soil erosion and reduction in plant growth/primary productivity;
g. Higher/more intense precipitation may lead to flooding that results in the death of plants/forest/organisms;

Note to examiners: For credit the response must include both climatic change and its impact on the cloud forest ecosystem.

Marking guidance:

Do not accept only "reduction in biodiversity" as an effect.