... Firstly, there is raw sewage, which is pumped directly into the sea. Many countries, both developed and developing, are guilty of doing this. Secondly, ships drop about 6 million tons of garbage ... the land. This can be the result of carelessness or a deliberate dumping of waste. the end Unit 7: Saving energy. Tape Transcript:Are you looking for a cheap, clean, effective source of power ... 1990s.3HNV 2010Chau: Thank you. Dad. Now I can answer all the questions for my assignment. the end Unit 6: THE INVIRONMENT. Tape Transcript:Our oceans are becoming extremely polluted. Most of this...