The table shows the mean carbon dioxide concentration in the atmosphere and the global temperature for six years.
| Year | Carbon dioxide concentration (ppm) | Global temperature compared with the long-term mean (∘C^\circ\mathrm{C}∘C) |
|---|---|---|
| 2014 | 397 | +0.75 |
| 2015 | 399 | +0.90 |
| 2016 | 403 | +1.01 |
| 2017 | 405 | +0.92 |
| 2018 | 407 | +0.85 |
| 2019 | 410 | +0.98 |
Which conclusion is best supported by the data?
The data prove that the rise in carbon dioxide concentration caused the rise in temperature.
The temperature rose by the same amount each year as the carbon dioxide concentration rose.
There is no link, because the temperature fell in some years while carbon dioxide rose.
Both generally increased, but the data alone do not show that one caused the other.
51 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.