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| Pregunta | Respuesta |
| Most wavelengths of electromagnetic radiation can pass through the Earth's atmosphere, but which type of radiation is absorbed? | Most wavelengths of electromagnetic radiation can pass through the Earth's atmosphere, but infrared radiation is absorbed. |
| Carbon dioxide occurs naturally in the atmosphere as a result of what? | Carbon dioxide occurs naturally in the atmosphere as a result of: - natural forest fires - volcanic eruptions - decay of dead plant and animal matter - its escape from the oceans - respiration. |
| What is man-made carbon dioxide caused by? | Man-made carbon dioxide is caused by fossil fuels, waste incineration, deforestation and cement manufacture. |
| Water vapour is the most significant greenhouse gas. How does almost all water vapour occur? | Almost all of the water vapour occurs naturally. |
| A mere 0.001% comes from what? | A mere 0.001% comes from human activity. |
| What is half of the greenhouse effect due to? | Half of the greenhouse effect is due to water vapour and a further quarter is due to clouds. |
| When is methane produced? | Methane is produced when organic matter decomposes in an environment lacking oxygen. |
| When is methane produced in natural sources? | Natural sources include wetlands, termites and oceans. |
| When is methane produced from man-made sources? | Man-made sources include the mining and burning of fossil fuels, the digestive processes in animals such as cattle, rice paddies and the burying of waste in landfills. |
| Does the electromagnetic radiation from the Sun have a relatively short wavelength or a relatively long wavelength? | The electromagnetic radiation from the Sun has a relatively short wavelength. |
| What happens to this radiation? | This radiation is absorbed by and warms the Earth. The Earth then re-radiates the energy as infrared radiation with a longer wavelength. |
| What happens to this longer wavelength radiation? | This longer wavelength radiation is absorbed by the greenhouse gases which warms the atmosphere. |
| Give the two opposite effects of dust in the atmosphere. | Dust in the atmosphere can have opposite effects: - the smoke from the factories reflects radiation from the town back to Earth. The temperature rises as a result - the ash cloud from a volcano reflects radiation from the Sun back into space. The temperature falls as a result. |
| It is important that decisions about what to do about global warming are made on the basis of what? | It is important that decisions about what to do about global warming are made on the basis of scientific evidence, not on the basis of unsubstantiated opinions. |
| What do the vast majority of scientists agree about climate change? | The vast majority of scientists agree that the evidence supports climate change. |
| The average temperature of the Earth has increased steadily during how many years? | The average temperature of the Earth has increased steadily during the past 200 years. |
| What do scientists not agree on about global warming and climate change? | What scientists do not agree on is the extent to which human activity has contributed. |
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