The Greenhouse Effect - Causes of the Greenhouse effect

 What is the Green house effect ?

The Earth is kept warm by it's atmosphere, which acts rather like a woolly coat - without it, the average surface temperature would be about -18 degrees Centigrade. Heat from the sun passes through the atmosphere, warming it up, and most of it warms the surface of the planet. As the Earth warms up, it emits heat in the form of infra-red radiation - much like a hot pan emits heat even after it's taken away from the cooker. Some of this heat is trapped by the atmosphere, but the rest escapes into space. The so-called "greenhouse gases" make the atmosphere trap more of this radiation, so it gradually warms up more than it should, like a greenhouse (although a greenhouse actually does this by stopping warm air rising and escaping from it).

Most of the countries which would suffer most from a rise in sea levels are the poor island states, so the islands in the Caribbean, South Pacific, Mediterranean and Indian Ocean have formed the Alliance of Small Island States, AOSIS, so they have a louder voice in international politics and can make the richer developed world listen to their problems. Britain would lose most of East Anglia, and to protect the coast line would cost an estimated 5 to 10 billion pounds.

The Greenhouse Effect - Possible Solutions

Reducing use of fossil fuels would considerably reduce the amount of carbon dioxide produced, as well as reducing the levels of the pollutants which cause acid rain. This can be achieved by either using less energy altogether, or using alternative energy sources. You can help save energy in lots of ways:

• Turn off lights when you leave a room
• If you have a car, don't use it for short journeys
• Basically, anything at all that uses less energy  

Eliminating the use of CFCs is something we can actually do.

Chlorofluorocarbons (CFCs) were invented in the 1920s, they are a compound of carbon containing chlorine and fluorine. CFCs are man made chemicals, so we call them synthetic chemicals. Since their introduction CFCs have been used as:

• Refrigerants in refrigerators and air conditioning units
• Propellants in aerosol cans
• Foaming agents in the production of packaging
• Cleaners used in the electronics industry
• Fire extinguisher chemicals

New refrigerants have been developed, and new aerosols use other propellants such as butane, so it is now actually quite difficult to get hold of CFCs (assuming you wanted to get some for something anyway).

Stopping deforestation by using renewable forests and planting a new tree whenever one is felled would help to raise the carbon dioxide absorbing ability of the planet.

We welcome your comments and suggestions.