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| Question | Answer |
| Describe the greenhouse effect | Some of the electromagnetic radiation from the Sun reaches the Earth and is absorbed. The Earth then re-emits it as infrared radiation. Various gases in the troposphere absorb some of this IR and re-emit it in all directions - including back towards the Earth, keeping us warm. |
| What are the 3 main greenhouse gases? | Water vapour Carbon dioxide Methane |
| What are the factors that determine how much a gas contributes to the greenhouse effect? | How much IR radiation one molecule of gas absorbs How much of that gas there is How long the gas stays in the atmosphere |
| In 1997, the Kyoto protocol was signed. What was this protocol? | Industrialised countries promised to reduce their greenhouse gas emissions to agreed levels |
| TRUE OR FALSE: The Kyoto protocol came to an end in 2012 and currently has no replacement | TRUE However, many governments agree that they need to reduce CO₂ emissions by around 50% by 2050 |
| in the UK, what has the government done to try to prevent global warming? | Created policies to use more renewable energy sources (e.g. wind) Encouraged the use of more energy-efficient alternatives to everyday objects (e.g. energy-saving bulbs and electric cars) |
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