The climate of the Earth is always changing. In the past it has changed as a result of natural causes. Nowadays, however, the term climate change is generally used when referring to changes in our climate which have been identified since the early part of the 1900's. These rapid changes that have been seen over recent years and those which are predicted over the next 100 years are thought to be mainly as a result of human behaviour rather than due to natural changes in the atmosphere.
The greenhouse effect is very important when we talk about climate change as it relates to the gases which keep the Earth warm. Many believe that it is the extra greenhouse gases which humans have released that will pose the greatest threat.
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