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Global warming (Some gases in the Earth’s atmosphere stop heat radiating…
Global warming
Some gases in the Earth’s atmosphere stop heat radiating into space from the Earth. This is called the greenhouse effect and the gases involved are called greenhouse gases.
Examples of greenhouse gases: methane, carbon dioxide, carbon monoxide and water vapor.
the process:
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2.The Earth absorbs electromagnetic radiation with short wavelengths and so warms up. Heat is radiated from the Earth as longer wavelength infrared radiation.
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The Earth has a natural greenhouse effect—it has been around since the planet formed and has sustained life for many millions of years.
We have always had greenhouse gases in our atmosphere. Without them the Earth would be too cold for us, or any other living thing, to survive.
Naturally-occurring greenhouse gases, such as carbon dioxide and methane, allow solar radiation to reach the Earth’s surface, while trapping radiation from the Earth on its way back out to space.
The trapped energy warms the Earth’s surface, making it about 35°C warmer than it would be if we didn’t have greenhouse gases in the atmosphere.
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Human activities are causing the release of large amounts of carbon dioxide. These activities include:
deforestation - cutting down trees for fuel, farms, buildings and roads
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Climate change
Increased global warming will lead to climate change – changes in the average weather experienced over 30 years or more. Climate change may make it impossible to grow certain food crops in some regions. Melting polar ice, and the thermal expansion of sea water, could cause rising sea levels and the flooding of low-lying land.
