What single greenhouse gas has risen from about 280 ppm before industrialisation to over 420 ppm today, mainly from the burning of fossil fuels?

Model answer

carbon dioxide

Also accepted: CO2

Explanation

Carbon dioxide is the greenhouse gas most closely tracked as the primary driver of the enhanced greenhouse effect since industrialisation.

Derived from ZIMSEC Advanced Level Geography 6037/1 Paper 1: Physical Component, November 2023 session, Q1

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