Reducing Emissions

This lesson covers the strategies and technologies used to reduce emissions of greenhouse gases and atmospheric pollutants, as required by AQA GCSE Chemistry specification (5.9.2 and 5.9.3). You need to understand the range of approaches available — from individual actions to international agreements — and be able to evaluate their effectiveness and limitations.

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Why Reducing Emissions Matters

The emission of greenhouse gases and atmospheric pollutants from human activities is causing:

• Climate change — rising global temperatures, sea level rise, extreme weather events.
• Air pollution — respiratory diseases, acid rain, global dimming.
• Environmental degradation — loss of biodiversity, ocean acidification, damage to ecosystems.

Reducing emissions is essential to limit these impacts and protect the environment, human health, and the economy.

Exam Tip: When discussing reducing emissions, always explain WHY it is important before describing HOW to do it. This shows the examiner that you understand the context and significance of the topic.

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Strategies for Reducing Greenhouse Gas Emissions

1. Switching to Renewable Energy Sources

Replacing fossil fuels with renewable energy sources eliminates greenhouse gas emissions from electricity generation. The main renewable energy sources are: