In the Arctic, the summer ice is melting, making it hard for polar bears to survive. Why is the world getting warmer? It's all because the "greenhouse gases" which trap the heat from the Sun in the atmosphere. Appropriate amount of greenhouse gases can make the Earth warm and comfortable, but excessive greenhouse gases can change the weather pattern all around the world and cause serious problems for us. This book, following polar bears' living environment, will show young readers the chain effect of climate changing and ways of how we can help to prevent it.