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Air composition
78% nitrogen, 21% oxygen, small amounts of others
Combustion
Burning in oxygen releasing energy
Complete combustion
Produces CO₂ and water
Incomplete combustion
Produces CO and soot
Carbon dioxide
Greenhouse gas contributing to global warming
Methane
Powerful greenhouse gas
Global warming
Rise in Earth’s temperature due to greenhouse gases
Climate change
Long-term changes in climate patterns
Acid rain
Formed from sulfur dioxide and nitrogen oxides
Effects of acid rain
Damage to plants, buildings, aquatic life
Water treatment
Filtration and chlorination
Pollution
Introduction of harmful substances into environment
Sources of pollution
Industry, vehicles, agriculture
Catalytic converter
Reduces harmful emissions from cars