Unit 5 A Delicate World Understanding Ideas 课件-2023-2024学年高中英语外研版（2019）选择性必修第二册

A delicate world unit 5 1 When we are talking about the ecosystem, most of us would only think about animals and plants. But the truth is our daily activities are playing a vital role in nature just like everything else. Humans are part of Earth’s ecosystems. Humans can affect ecosystems in positive and negative ways. For example, to have a positive influence on ecosystems, people can plant trees, feed and protect animals, recycle thins, etc. However, deforestation, air and water pollution and excessive waste affect ecosystems in a negative way. from chaos to conservation Macquarie Island: 5 Learning objectives: At the end of the class, you will be able to: 1. Conclude the whole process about how Macquarie Island was destroyed. 2. Learn to retell the passage by using some phrases which talk about cause and effect. 3. Think deeply about the effect of these human activities on Macquarie Island and call on people to protect our delicate world. 1. What can you see in this video ? 2. What do you think of them? Lead-in Watch a micro-video(微课视频) and answer questions: What do you think of this island? Macquarie Island: Chaos to Conservation from Read for general idea Tip1： • the first sentene of each paragraph • key words of each paragraph the main idea of each paragraph Para 1: the general introduction Para 2-3: the process from harmonious balance to choas Para 4: measures to save it Para 5:the worse situation Para 6:actions to solve the problem what happened to Macquarie Island? After rats, mice,cats and rabbits were brought to Macquarie Island ,they attacked native birds, ate native vegetation and caused soil erosion, which broke the island’s ecosystem. But now the island's ecology is on the road to recovery with humans’ efforts. location shape landscape inhabitants in the South-west Pacific ocean , halfway between Australia and Antarctic. long and thin green grass and bare rock contrast dramatically, giving it a w