A community heating system can use natural gas extracted from an underground deposit or wood harvested from a managed plantation.
| Fuel | Amount used each year in kg | Amount replaced naturally each year in kg |
|---|---|---|
| Natural gas | 9.0 × 105 | 9.0 × 10-1 |
| Plantation wood | 4.0 × 106 | 5.0 × 106 |
The amount of fuel needed each year is expected to double. The natural replacement rates will remain unchanged.
Calculate how many orders of magnitude greater the annual use of natural gas is than its annual natural replacement.
Evaluate the sustainability of using each fuel now and after the amount of fuel needed doubles.
87 exam-style questions on AQA GCSE Chemistry 10.1 Using the Earth's resources and obtaining potable water, covering 10.1.1 Using the Earth's resources and sustainable development, 10.1.2 Potable water, 10.1.3 Waste water treatment, and 10.1.4 Alternative methods of extracting metals. Each one has a worked solution and a mark scheme showing where the marks go.