Carbon Cycle: Stores, Flows & Climate Feedbacks — A-Level Geography Revision
Revise Carbon Cycle: Stores, Flows & Climate Feedbacks for A-Level Geography. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel and OCR.
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Go to Ecosystems Under Human PressureWhat is Carbon Cycle: Stores, Flows & Climate Feedbacks?
This topic examines the global carbon cycle, including the major stores of carbon (e.g., atmosphere, oceans, biosphere) and the flows between them. It investigates the impact of human activities, particularly the burning of fossil fuels, on the carbon cycle and the implications for climate change. The topic also explores the concept of climate feedbacks, both positive and negative.
Board notes: A key topic for AQA, Edexcel, and OCR, with strong links to climate change. AQA focuses on the concept of the carbon budget. Edexcel requires an understanding of the role of carbon in supporting ecosystems. OCR often asks students to evaluate the effectiveness of different climate change mitigation strategies.
Step-by-step explanationWorked example
To explain the concept of a positive feedback loop in the context of climate change, a student could use the example of melting permafrost. As global temperatures rise, permafrost in the Arctic thaws, releasing large quantities of methane, a potent greenhouse gas. This leads to further warming, which in turn causes more permafrost to melt, creating a self-reinforcing cycle.
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Common mistakes
- 1Confusing the short-term and long-term carbon cycles.
- 2Not understanding the role of the oceans as a carbon sink.
- 3Describing the greenhouse effect without explaining the role of specific greenhouse gases like carbon dioxide and methane.
Carbon Cycle: Stores, Flows & Climate Feedbacks exam questions
Exam-style questions for Carbon Cycle: Stores, Flows & Climate Feedbacks with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel and OCR specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Carbon Cycle: Stores, Flows & Climate Feedbacks
Core concept
This topic examines the global carbon cycle, including the major stores of carbon (e.g., atmosphere, oceans, biosphere) and the flows between them. It investigates the impact of human activities, part…
Frequently asked questions
What is the difference between the greenhouse effect and global warming?
The greenhouse effect is a natural process where certain gases in the atmosphere trap heat, keeping the Earth warm enough for life. Global warming is the enhancement of this effect due to the increase in greenhouse gas concentrations from human activities, leading to a rise in global average temperatures.
What are some of the strategies for mitigating climate change?
Strategies for mitigating climate change include reducing greenhouse gas emissions (e.g., by switching to renewable energy sources and improving energy efficiency), and enhancing carbon sinks (e.g., through afforestation and carbon capture and storage).