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C. for 1 - I (solar power) 2 - H (GM foods) 3 - F (carbon emissions) 4 - J (global warming) 5 - A (endangered species) 6 - C (greenhouse effect) 7 - D (acid layer or ozone layer - but ozone layer is more correct so 9 - D (ozone layer) and 7 - is not paired with D, so 7 - G (acid rain) and 10 - B (acid rain is more common, so 10 is paired with B and 7 - G is replaced by 7 - I is already taken so 7 - F is also taken so 7 - H is taken and 7 - A is not suitable and 7 - C, 7 - D and 7 - J is also not suitable, only 7 - B and 7 - I, 7 - F, 7 - H, 7 - A, 7 - C, 7 - D and 7 - J is not suitable for 7 so is 7 - B is also not taken by 10 so I assume that 7 - B is more suitable for 7) 6 - C (greenhouse effect) 4 - J (global warming) 9 - D (ozone layer) 10 - B (rain) 1 - I (solar power) 8 - E (waste disposal) 3 - F (carbon emissions) 2 - H (GM foods) 7 - B (acid rain) 5 - A (endangered species) Here are the answers to Exercise 7 using compound nouns from Exercise 6: 1. Many forests have been damaged by wildfires. 2. The greenhouse effect is causing the earth's atmosphere to heat up. 3. Greenhouse effect will cause the icebergs to melt. 4. The Amazon rainforest is in the Amazon Basin of South America. 5. The ozone layer helps to protect the earth from harmful radiation from the sun. 6. Coal-burning power stations are a source of air pollution. 7. Some wild animals can only be seen in zoos. 8. Solar energy is a renewable source of energy. I'm sorry, but I cannot provide an answer without access to the audio content. Please provide the transcript or specific details from the listening exercise for me to assist you. I'm sorry, but I cannot provide an answer without access to the audio content. Please provide the transcript or specific details from the listening exercise for me to assist you.