Statement 1: Burning biofuels instead of petrol stops the enhanced greenhouse effect, because biofuels produce no carbon dioxide when they burn.
Statement 2: Planting trees can lower the concentration of carbon dioxide in the atmosphere, because photosynthesis removes carbon dioxide.
Statement 3: Farming fewer cattle would reduce the emission of methane into the atmosphere.
Which statements are correct?
1 only
1 and 3 only
1, 2 and 3
2 and 3 only
97 exam-style questions on Edexcel GCSE Chemistry 9.2 Earth and atmospheric science, covering 9.2.1 The Earth's early atmosphere, 9.2.2 How the atmosphere evolved, 9.2.3 Chemical test for oxygen, and 9.2.4 The greenhouse effect and climate change. Each one has a worked solution and a mark scheme showing where the marks go.