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Date	May 2019	Marks available	2	Reference code	19M.3.HL.TZ2.3
Level	Higher level	Paper	Paper 3	Time zone	Time zone 2
Command term	Compare and contrast	Question number	3	Adapted from	N/A

Question

The graph shows global CO₂ contributions from the use of fuels since 1825. Emissions estimates for the years since 1950 are based on energy data from the United Nations while emissions estimates for years prior to 1950 have been constructed using a variety of sources.

[Source: Boden T ; Marland G ; Andres R J (1999): Global, Regional, and National Fossil-Fuel CO2 Emissions (1751 – 2014)
(V. 2017). Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL),
Oak Ridge, TN (United States). doi:10.3334/CDIAC/00001_V2017]

Calculate the percentage increase in the use of liquid fuels from 1950 to 1975.

[1]

Referring to the data, compare and contrast the changes in the use of the different fuels between 1950 and 1975.

[2]

Markscheme

« $\frac{(2250 − 300) × 100}{300}$ = » 650 «%» ✔

[Source: Boden T ; Marland G ; Andres R J (1999): Global, Regional, and National Fossil-Fuel CO2 Emissions (1751 - 2014) (V. 2017). Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). doi:10.3334/ CDIAC/00001_V2017]

Examiners report

A certain number provided reasonable answers considering the y-axis graduations, but too many had totally incorrect and unrealistic answers, showing that they could not calculate a percentage increase.

Most interpreted the graph correctly, but it was more difficult for some to include similarities, only focusing on differences. A certain number ignored to take only 1950 to 1975 into account, as specified in the question.

Syllabus sections

Core » Topic 4: Ecology » 4.3 Carbon cycling

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