AQA · Chemistry · 8462
GCSE Chemistry: Human activities which contribute to an increase in greenhouse gases in the atmosphere
Chemistry of the atmosphere · AQA GCSE Chemistry (8462), specification point 4.9.2.2. Cards are generated from the exam board's own specification for "Human activities which contribute to an increase in greenhouse gases in the atmosphere", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Which two greenhouse gases are increased by human activities?
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Carbon dioxide and methane.
Name two human activities that increase atmospheric carbon dioxide.
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Burning fossil fuels (e.g. in power stations and vehicles) and deforestation (fewer trees remove CO₂ by photosynthesis).
Name two human activities that increase atmospheric methane.
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Rearing cattle/livestock (digestion releases methane) and rice paddy farming or decomposition of waste in landfill sites.
What type of evidence supports the view that human activity causes global warming?
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Peer-reviewed evidence — results checked by other scientists before publication.
Many scientists believe human activities will raise the temperature of the Earth's atmosphere at the surface, resulting in global ?.
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climate change
Why is it difficult to predict global climate change accurately?
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The climate is a very complex system with many interacting factors, so it is hard to model.
Why may media reports about climate change be unreliable?
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They may use simplified models, speculation or opinion based on only part of the evidence, and so can be biased.
Opinions about climate change presented in the media may be based on only parts of the evidence and may be ?.
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biased
What is peer review in science?
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The checking of a scientist's results and methods by other experts in the field before publication.
Why is peer review important for climate change research?
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It checks that results are valid and reliable, reducing the chance that biased or poorly supported claims are accepted.
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