Every summer, the Serengeti plains（平原）of Africa are worth visiting. Millions of wild animals begin their 1,800-mile journey northwards on their annual migratory（迁移的）route.

In the month of November, polar bears in their thousands cross the Canadian Arctic, as they head towards the ice sheets of Hudson Bay. The sea ice that forms every winter is the key to the bear’s managing to exist, for here they hunt for seals (海豹).

The Great Bustard, one of the heaviest flying birds, migrates each year across Europe and Asia to its wintering grounds. Unluckily, these and other migratory animals are in danger from human activity.

We have written several articles on climate change and the influence of rising ocean temperatures. Since 1979, ice sheets in the Arctic have gone down by 30 percent. What does this mean for polar bears? They are forced to stay on land for longer periods of time, which delays their search for food. As a result, bears today are 60 pounds lighter than what they were. Besides, smaller bears also produce weaker babies, and their chances of survival are at risk. In the plains of Africa, migratory animals like gazelles are traveling long distances for food, just to avoid falling prey（牺牲品）to humans who hunt them.

In an unusual step, experts from 120 countries have agreed to protect 31 migratory mammals, fish and birds. The United Nation’s 11th annual Conservation of Migratory Species of Wild Animals (CMS) was held in Quito, Ecuador. For the first time, 900 experts attended the conference, and the enthusiastic support shows the world is united in conservation（保护）efforts.

What does getting on a protected list mean? Countries that have signed the agreement will be required to pass laws locally and work with other countries that fall within the animal's migratory path. Only one animal did not make the list. The African lion was rejected（拒绝）for lack of information of the countries where it lives.

The Youth Climate Summit (气候峰会) a week-long festival of climate action for primary and middle schools in the UK, starts on 9 November. It aims to create a fairer, more environmental world and make promises that will help the planet. Climate change is the long-term changes in the world’s weather patterns that are mostly caused by human activity. “Unlike world leaders,” say the summit’s organizers, “young people are refusing to let it drop off the plan.”

Each day has a topic, which includes food and fashion, looking at how humans harm the environment and how to save the planet. Organizations are leading some on line activities. For example, the Marine Conservation Society is hosting meetings on protecting sea fish. Separately, the environmental organization Greenpeace is running a workshop on how to turn worn-out clothing into something new and wearable.

The summit will finish on 13 November, when youth ambassadors (大使) wants schools to stop paper waste. Max, another 16-year-old ambassador wants schools to organize more trips and activities that get students outside to experience the beauty of nature. As part of the summit, hundreds of schools across the country are signing up to the Let’s Go Zero activity, aiming to become carbon-zero (零碳的) by 2030.

Carbon-zero schools are ones that promise to stop emitting carbon in seven areas, including where they get their food and how they use water and recycle their waste. The activity is run by Ashden, a charity working towards climate solutions. Ashden hopes that schools will be able to help each other by sharing ideas and methods. It is also calling on the Government to back the promise. Head over to transform-our-world.org where you can find out more.

Many people don’t have interest in rainforests. 【小题1】 Secondly, they seem dark and dangerous. There are snakes and dangerous plants everywhere. However, Jeff Corwin is different from most people. He has been interested in rainforests since he was a child.

Rainforests produce much of the air we breathe every day. 【小题2】 Since then, he has had one goal to tell people the importance of rainforests. Besides, he is most interested in the special animals living there.

【小题3】 Many of the animals there cannot live anywhere else. The rainforests are important to these animals, and these animals are important to the rainforests, too. They are good for the forests, as each one plays a role in keeping the rainforests healthy.

Rainforests are disappearing very quickly. 【小题4】 The plants and animals that used to live in these forests either die or must find a new forest as their home. The good news is that there are a lot of people who want to save rainforests. The bad news is that saving rainforests is not going to be easy. It will take the efforts of many people working together.

【小题5】 He has started clubs for young people. The clubs teach ways to help protect rainforests. Jeff believes education is the best way to protect rainforests. When people learn more about rainforests, they will try to help save them.