A household compares two washing machines. Each machine is expected to complete 1500 washes before it is disposed of.
The table shows the greenhouse gases released during different stages of each machine's life cycle.
| Life cycle stage | Machine A | Machine B |
|---|---|---|
| Making the machine in kg | 180 | 260 |
| Using the machine in kg per wash | 0.20 | 0.12 |
| Disposing of the machine in kg | 12 | 15 |
A student concludes that Machine A has the lower carbon footprint because making Machine A releases fewer greenhouse gases.
Evaluate the student's conclusion.
73 exam-style questions on AQA GCSE Chemistry 9.2 Carbon dioxide and methane as greenhouse gases, covering 9.2.1 Greenhouse gases, 9.2.2 Human activities which contribute to an increase in greenhouse gases in the, 9.2.3 Global climate change, and 9.2.4 The carbon footprint and its reduction. Each one has a worked solution and a mark scheme showing where the marks go.