AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher · 5.9.2.2
Revise AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher specification point 5.9.2.2, Human activities which contribute to an increase in greenhouse gases in the atmosphere, with free active-recall flashcards. Flip through the set or review every question and answer below.
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What is the overall causal chain linking human activity to global climate change?
Human activity increases atmospheric greenhouse gases, changing Earth's energy balance and likely warming the surface. This warming can alter long-term climate patterns.
Why must evidence about global climate change be judged carefully?
The climate system is extremely complex.
Why do climate models include assumptions and uncertainties?
They simplify reality when representing the climate system.
What three aspects should be checked when evaluating a climate change report?
Why should scientific claims in media reports not be accepted uncritically?
Reports may focus on selected evidence or present biased opinions.
How does peer review help improve the reliability of climate change research?
It allows other scientists to check the methods, data and conclusions.
Why is it important to communicate climate change results clearly to different audiences?
So that the evidence, limitations and uncertainty are properly understood.
Why does burning fossil fuels increase atmospheric carbon dioxide?
Carbon in the fuels reacts with oxygen during combustion, forming carbon dioxide.
How can carbon stored in trees enter the atmosphere after deforestation?
It can be released as carbon dioxide when the wood burns or decays.
How does removing trees affect atmospheric carbon dioxide uptake?
It reduces carbon dioxide uptake by photosynthesis.
How does livestock farming increase atmospheric methane?
Microorganisms in ruminants’ digestive systems produce methane, which the animals release.
How does organic waste in landfill produce methane?
Microorganisms break down the waste in conditions with little or no oxygen, producing methane.