This topic summary covers Knowledge Organiser: Climate Change within Climate Change for GCSE Chemistry. Revise Climate Change in Atmosphere for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 17 of 17 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Knowledge Organiser: Climate Change
Evidence (TIMC)
- Temperature records: +1.1°C since 1880
- Ice cores: highest CO₂ in 800,000 years
- Melting ice: 13% Arctic loss per decade
- Changing seasons: earlier spring events
Human Causes
- Fossil fuels: 75% of CO₂ emissions
- Deforestation: 11% of CO₂ emissions
- Agriculture: methane from cattle/rice
- Industry: cement (CaCO₃ → CaO + CO₂)
Consequences (SIRF)
- Sea levels rise (23 cm since 1880)
- Ice caps melt
- Rainfall patterns change
- Flooding/extreme weather increases
Mitigation Strategies
- Renewable energy (solar, wind)
- Electric vehicles
- Reforestation
- Carbon capture and storage
- Individual actions: less driving/flying/meat
Key Equations
- CaCO₃ → CaO + CO₂ (cement production — releases CO₂)
- C + O₂ → CO₂ (combustion of carbon fuels — main source of CO₂)
- 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (reforestation removes CO₂ via photosynthesis)
Common Mistakes
- Saying climate change is the same as the greenhouse effect: The greenhouse effect is a natural mechanism; climate change refers to the human-enhanced warming causing global disruption — they are related but different
- Confusing weather and climate: Weather is day-to-day conditions; climate is long-term average patterns — climate change affects climate, not individual weather events directly
- Forgetting that deforestation increases CO₂ in two ways: Trees are cut AND burned (releasing CO₂) AND there are fewer trees to absorb CO₂ via photosynthesis — both effects must be mentioned
- Saying climate change has only scientific solutions: Addressing climate change requires both technological solutions AND political/social action — examiners expect balanced answers covering multiple types of response
Practice questions for Climate Change
Which statement correctly describes the difference between weather and climate?
Explain three consequences of climate change for the environment or human populations. [3 marks]
Quick recall flashcards
How have CO₂ levels changed since 1880?
Increased from 280 ppm to over 420 ppm (a 50% increase)
At what rate is Arctic sea ice declining?
13% per decade