3.+Keywords+and+Definitions.

Do you need additional information? Try using these keywords and phrases to search the internet as they directly relate to the issues of human impact. Remember to choose words carefully when using search engines.
 * Keywords and Definitions **

__**Antarctica **__//is the southernmost continent in the world and surrounds the South Pole // __**Human impact **__//the environmental changes due to human actions// __**atmosphere **__//the layer of gases that surrounds the Earth // **__carbon dioxide __** //a greenhouse gas produced by burning fossil fuels and clearing forests// __**chlorofluorocarbons **__ //chemicals that damage the ozone layer// __**climate change **__ //changes in weather patterns caused by global warming// __**global warming **__ //an increase in the average surface temperature of the Earth// __**ozone layer **__ //the protective layer in the upper atmosphere// //**<span style="font-family: 'Times New Roman','serif';">World Heritage Area **//<span style="font-family: 'Times New Roman','serif';"> //a special area of outstanding beauty or// //<span style="font-family: 'Times New Roman','serif';">cultural importance that is protected for the benefit of future generations //

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