Read the Greenhouse-Gas Chart
A percentage chart tests whether you can map each label to its relative contribution without mixing up gases.
Greenhouse Gases and Warming is the central idea in this question pattern. Identify the condition in the stem before applying the method below.
Read the chart before naming gases
First record each sector’s share: 60%, 20%, 14% and 6%. In this source chart the labels map to CO₂, methane, CFCs and nitrous oxide respectively. Translate the question’s label order only after writing that mapping down.
Keep source estimates in context
The linked question asks for interpretation of a particular chart. Its percentages are the source’s values and should not be presented as current emissions or forcing estimates without a dated, updated source.
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- ✓Map each chart label to its percentage first.
- ✓CO₂ 60%, CH₄ 20%, CFCs 14%, N₂O 6% in the linked source chart.
- ✓Distinguish a question’s historical chart from current measurements.
Do not answer in gas order if the question asks for labels in a different order.
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