Sơ đồ tư duy tiếng Anh lớp 9 unit 8 có thể được tổ chức như sau:

I. Introduction to the topic (Giới thiệu chủ đề)
- Discuss the importance of environmental protection and conservation.
- Introduce key vocabulary related to the environment and nature.

II. Causes of environmental problems (Nguyên nhân gây ra vấn đề môi trường)
- Deforestation: explain the reasons behind deforestation such as logging, agriculture, and urbanization.
- Pollution: discuss different types of pollution including air pollution, water pollution, and soil pollution.
- Climate change: explain the causes and effects of climate change, including greenhouse gas emissions and global warming.

III. Effects of environmental problems (Tác động của vấn đề môi trường)
- Loss of biodiversity: discuss the impact of environmental problems on plant and animal species.
- Natural disasters: explain how environmental problems can lead to more frequent and severe natural disasters such as floods, hurricanes, and droughts.
- Health issues: discuss the health risks associated with environmental problems, including respiratory diseases and waterborne illnesses.

IV. Solutions to environmental problems (Giải pháp cho vấn đề môi trường)
- Conservation and preservation: explain the importance of conserving natural resources and preserving ecosystems.
- Renewable energy: discuss the benefits of using renewable energy sources such as solar power and wind power.
- Recycling and waste management: explain the importance of recycling and proper waste management to reduce pollution and conserve resources.

V. Conclusion (Kết luận)
- Summarize the main points discussed in the sơ đồ tư duy.
- Emphasize the importance of individual and collective actions in protecting the environment.

Note: Sơ đồ tư duy này chỉ là một gợi ý và có thể được điều chỉnh và mở rộng tùy theo nhu cầu và mục tiêu của giáo viên và học sinh.