|E6 Oceans in Trouble
|1.1 Where are the major oceans and seas in the world?
|1.2 What is a marine ecosystem?
|1.3 What are energy flow and nutrient cycling in a marine ecosystem?
|2.1 Why are oceans important to the natural environment?
|2.2 What food resources do oceans provide for human beings?
|2.3 What energy resources do oceans provide for human beings?
|2.4 What mineral resources do oceans provide for human beings?
|2.5 What other functions do oceans have?
|3.1 What is overfishing?
|3.2 What are the impacts of overfishing on the marine ecosystem?
|3.3 What are the impacts of overfishing on society and the economy?
|3.4 What are the solutions to overfishing?
|3.5 How does Hong Kong protect its fishery resources?
|4.1 What is marine pollution?
|4.2 What are the impacts of marine pollution on the ecosystem?
|4.3 What are the impacts of marine pollution on society and the economy?
|4.4 What are the solutions to marine pollution?
|4.5 How does Hong Kong tackle marine pollution?
|4.6 Why is international cooperation important? What are the challenges met?
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