Global warming is the ____ used to describe the ____ of the average temperature on Earth. It has to do with the overall climate of the Earth rather than the weather on any given day. It is a very complex ____. Some scientists disagree as to what caused the rise in ____ that occurred during the end of the ____ century. Things that can have an impact on ____ warming include the natural temperature fluctuations of the planet, greenhouse gases such as ____ dioxide, volcanic ____ and increased solar activity.


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