AQA · Chemistry · 8462
GCSE Chemistry (AQA): Carbon Footprints
Topic 9 — Chemistry of the Atmosphere. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Carbon Footprints - Measuring Footprints | Reducing Emissions (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 9.03 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_9.03.
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How can governments reduce greenhouse gas emissions from companies?
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By introducing new laws, or by taxing companies according to how many greenhouse gases they emit.
What is a carbon footprint?
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The total amount of carbon dioxide and other greenhouse gases emitted over the entire life cycle of a product, service or event.
Where is captured carbon dioxide stored?
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Deep underground in cracks in rocks, such as old oil wells, where it cannot escape into the environment.
How does switching to renewable energy sources reduce a carbon footprint?
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Sources such as wind, solar and nuclear replace fossil fuels, so far less carbon dioxide is released when energy is generated.
What does carbon capture technology do?
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It captures the carbon dioxide formed when fossil fuels are burned before it can escape into the atmosphere.
Why does reducing waste lower greenhouse gas emissions?
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Waste is often broken down by decomposers, which release methane — a greenhouse gas.
Why is switching away from fossil fuels economically difficult?
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Renewable energy is often more expensive, and the entire economy is currently built on fossil fuels.
Give one benefit of calculating carbon footprints.
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It identifies the most polluting activities, so their emissions can be targeted for reduction and products compared for environmental damage.
Why is a rough carbon footprint estimate still useful?
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It shows which things are the worst emitters and allows different products or activities to be compared.
Why is measuring a carbon footprint accurately so difficult?
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Every stage of the life cycle must be accounted for — raw materials, manufacturing, use and disposal — and some emissions, such as transporting parts worldwide, are easily missed or impossible to quantify.
Why are international agreements on emissions hard to reach?
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No country wants to agree to measures that could damage its economy unless it is certain every other country will do the same.
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