Choose a specific ecosystem (eg
a coral reef, a desert, a rainforest) and briefly describe a situation where human intervention has significantly altered it (either for the better or the worse).
Remember to describe the ecosystem both before and after the changes and explain the factors that have caused the transformation (examples would include logging companies clearing large areas of forest or the introduction of a treatment plant that reduced the amount of raw sewage piped into the sea).
Please make sure to provide references
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