Which gas, released mainly by burning fossil fuels, makes the largest human contribution to the enhanced greenhouse effect?
Answer and explanation
Correct answer: D. Carbon dioxide
- Step 1: Burning coal, oil and natural gas releases very large amounts of carbon dioxide, which is responsible for the biggest share of human-caused warming. Answer: Carbon dioxide. Why not the others: Methane is a stronger greenhouse gas per molecule but is released in much smaller amounts, mainly from farming and landfills; nitrous oxide comes mostly from fertilisers; and ozone is not released directly by burning fossil fuels.
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