Explain the issue/concept, the mechanisms involved and its significance to the human environment.

Remember to explain the issue/concept, the mechanisms involved and its significance to the human environment.
Please use at least 3 sources of information and provide complete citation. One source may be your text book, one source needs to be a current event from an internet news or science website, and the other from a scientific source preferable also online.
answers the corresponding questions, insert a picture and/or chart, and includes citations for all sources, pictures and data used.

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