Plants play a crucial role in regulating the carbon cycle by absorbing carbon dioxide to produce glucose.
Give the balanced chemical symbol equation for photosynthesis.
The table below shows estimated annual global carbon dioxide (CO2\text{CO}_2CO2) emissions specifically from land-use changes and deforestation between 1990 and 2018.
| Year | Mass of CO2\text{CO}_2CO2 released (millions of tonnes) |
|---|---|
| 1990 | 4000 |
| 1997 | 4350 |
| 2004 | 4700 |
| 2011 | 5100 |
| 2018 | 5400 |
Calculate the percentage increase in the annual mass of CO2\text{CO}_2CO2 released from land-use changes globally between 1990 and 2018.
Give three negative environmental consequences of the enhanced greenhouse effect caused by rising atmospheric carbon dioxide levels.
Explain how large-scale reforestation (replanting forests on cleared land) can help limit the increase of atmospheric carbon dioxide.
44 exam-style questions on Edexcel IGCSE Biology Human influences on the environment. Each one has a worked solution and a mark scheme showing where the marks go.