Greenhouse gases
Greenhouse gases have always been present in our atmosphere. They play an important role – forming a ‘blanket’ which traps much of the solar radiation reflected from the Earth’s surface so that our planet stays at a habitable temperature for humankind and other species – about 30°C warmer than it would otherwise be. This process is known as the ‘greenhouse effect’. In recent decades the concentration of greenhouse gases has changed, strengthening the greenhouse effect. Levels of greenhouse gases are higher now than at any other point during the past 650,000 years.
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Useful links
Wikipedia Helpful definitions
Guardian Record rise in Greenhouse Gases
BBC Useful definitions
DEFRA UK Government’s website
Greenfacts Facts on health and the environment