Learning objective

Identify the sources and consequences of air pollution from methane and carbon dioxide, focusing on the enhanced greenhouse effect and climate change.

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Exam focus

Cambridge IGCSE BiologyHuman influences on ecosystemsCore content

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Quick explanation

This point belongs to Pollution, especially Pollution outcomes.
You need to be able to identify the sources and consequences of air pollution from methane and carbon dioxide, focusing on the enhanced greenhouse effect and climate change.
The key ideas to know are Describe.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

Describe

Why it matters

This objective helps connect Pollution outcomes to exam-style questions, flashcards, and revision notes for Pollution.

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Practice Questions7 linked questions

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Paper 3Theory (Core)5 marks

Description

Methane is released from livestock digestion and landfill decomposition. Carbon dioxide is produced by burning fossil fuels and deforestation.

a
Identify two sources of methane that contribute to air pollution.
Your answer
Aim for approximately 2 distinct marking points.
[2]
b
Describe how methane and carbon dioxide contribute to the enhanced greenhouse effect.
Your answer
Aim for approximately 3 distinct marking points.
[3]

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