You should spend about 20 minutes on this task.
The graphs below show the size of the ozone hole over Antarctica and the production of three ozone-damaging gases from 1980 to 2000.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
Write at least 150 words.
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Task 1 Multiple Graphs Band 9 Sample Report
The diagrams illustrate the ozone hole size over Antarctica and the amount of three different types of gases that damaged the layer from 1980 to 2000.
Overall, the size of the ozone hole grew larger over the whole period. The production of CFC-12 and N2O increased, but the average release of CFC-11 declined.
The size of the ozone hole increased from around 500,000 km2 to 2,000,000 km2 from 1980 to 1990, followed by a decline to roughly 1,000,000 km2 in the next three years. However, a drastic increase was witnessed afterwards, and the size reached to 4,000,000 km2 in 2000, which was around 8 times more than in 1980.
The amount of CFC-11 emission was the highest in 1980, at about 70 million tonnes. It remained mostly stable from 1980 to 1983, then experienced a continuous decrease over the period, to less than 10 million tons in 2000. The production of CFC-12, on the contrary, remained a slow increase from 30 million tons to about 40 million tons. N2O, however, only appeared after 1990, increased dramatically from 0 to 30 million tons over 10 years, which might contribute to the increase of the ozone hole after 1993.
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