Scientists measure the concentration of carbon dioxide in the atmosphere at an observatory.
| Year | Carbon dioxide concentration (ppm) |
|---|---|
| 1960 | 317 |
| 1990 | 354 |
| 2020 | 414 |
Assume the concentration keeps increasing at the same mean rate as it did between 1990 and 2020.
In which year will the concentration first reach 450 ppm?
2038
2042
2049
2056
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.