Lesson 4 Global warming

Unit 1 Me and my class
　　Lesson 1 New friends, new subjects
　　Lesson 2 What will I be?
　　Lesson 3 Best friends
　　Lesson 4 My first week
　　Lesson 5 Rich or poor? It doesn't matter!
　　Many faces, one picture
Unit 2 Festivals and holidays
　　Lesson 1 Chinese festivals and holidays
　　Lesson 2 Festivals in autumn
　　Lesson 3 The Spring Festival
　　Lesson 4 The Dragon Boat Festival
　　Lesson 5 Special New Year celebrations
　　Special festivals around the world
Unit 3 Better you, better me!
　　Lesson 1 What makes you unique?
　　Lesson 2 Practice makes perfect!
　　Lesson 3 Believe in yourself!
　　Lesson 4 Be happy with yourself!
　　Lesson 5 I made it!
　　Time is life — the story of Lu Xun
Unit 4 Being a good learner
　　Lesson 1 How to learn physics
　　Lesson 2 Karen's hair stood up!
　　Lesson 3 My learning experiences
　　Lesson 4 My way, the best way
　　Lesson 5 What type of learner am I?
　　I love learning Chinese!
Unit 5 Work education
　　Lesson 1 Learning to cook
　　Lesson 2 The importance of physical work
　　Lesson 3 Learning by doing
　　Lesson 4 I take pride in my work!
　　Lesson 5 A physical work program
　　What's work education?
Unit 6 Natural wonders of the world
　　Lesson 1 Amazing nature
　　Lesson 2 A home to wild animals
　　Lesson 3 Great rivers
　　Lesson 4 A trip to the Amazon Rainforest
　　Lesson 5 Landforms of China
　　Natural wonders
Unit 7 Let's volunteer!
　　Lesson 1 I'd like to volunteer!
　　Lesson 2 Join us!
　　Lesson 3 Let's go volunteer!
　　Lesson 4 Li Lin's volunteering story
　　Lesson 5 You're welcome to help out!
　　Volunteers make the Games!
Unit 8 Protecting the environment
　　Lesson 1 Let's clean it up!
　　Lesson 2 Look at the plastic!
　　Lesson 3 The green miracle
　　Lesson 4 Global warming
　　Lesson 5 It is everyone's duty!
　　World Environment Day