Gas Detail View
Carbon Dioxide (CO₂)
Percentage in air
0.04%
CO₂ is only a tiny fraction of the atmosphere, but it has a powerful effect on temperature because it is a greenhouse gas.
Role in climate
CO₂ traps heat from the Sun. Increasing CO₂ from burning fossil fuels leads to global warming and climate change.
Role in living things
Plants use CO₂ in photosynthesis to make glucose and oxygen. Animals release CO₂ when they respire.
Main sources
- Burning coal, oil and natural gas in power stations.
- Cars, planes and factories.
- Deforestation (fewer trees to absorb CO₂).
Reducing CO₂ emissions and planting more trees are key ways to slow climate change.
O
C
O
Linear molecule
Formula: CO₂ • Greenhouse gas • Colorless, acidic in water
Quick Check
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Question
Which statement best describes carbon dioxide's role on Earth?
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