| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ2.19 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
The following graph refers to questions 19 and 20. It shows variation in the concentration of CO2 in the atmosphere as measured at Mauna Loa in Hawai’i. The small inset graph shows the variations in CO2 during a one year period.
What is the main cause of the increase in CO2 levels from 1960 to 2000?
A. Burning fossil fuels
B. Destruction of the ozone layer
C. Increases in ultraviolet light penetrating the Earth’s atmosphere
D. Reforestation
Markscheme
A
Examiners report
Assessment statement 5.2.2 says to analyze the changes in concentration of atmospheric carbon dioxide using historical records. This means candidates should have used the data provided, or data of a very similar nature. Most candidates found the questions easy.
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