—You're welcome. Tm sure everyone will do the same thing.

—Thank you, Mrs. Li.

Global warming (全球变暖) is a big problem and it makes the Earth sick. So, what can we do to protect the Earth? Here are some ways of helping our beautiful Earth.

First, we should use energy wisely. Summer is coming and the weather becomes hot. Many people turn on the air conditioner (空调) to keep cool. But using the air conditioner too much is not good for the environment. Turn off the air conditioner while you are sleeping at night or when you are away during the daytime.

Recycling (回收利用) can also save the Earth. Glass, bottles and newspapers can all be recycled. This way may make less pollution, and save more money.

Try to use less water. Turn off the shower while you are washing your hair. Use the water to water flowers after you finish washing. Ask people to stop throwing rubbish into rivers and lakes.

Planting trees is also a good way to help the Earth. So, why don't we plant as many trees as possible? Trees help keep the air clean and fresh by giving off oxygen (氧气). They can keep everything around them cool in hot seasons.

In fact, there are many things we can do in our daily life. If everyone can understand the importance of saving the Earth and do something small to help, our Earth will be better.

—Because people always throw rubbish into it and the rubbish__________ it.

—OK. I get it.

—What a poor boy！

Air pollution is one of the most serious problems for people nowadays. But some people in the US say that they have found a way to solve the problem. In many

cities, hundreds of people ride bikes instead of (代替) taking a bus or driving a car to work every day. In New York, some bike riders even make a group. Its name is "Bike for a Better City" They say if more people ride bikes to work, there will be fewer cars and less air pollution. They want to solve the problem of air pollution.

The members in the group always try to get help for the bike riders. They want to build roads for bikes only because it's not safe for bike riders to use the same roads with car drivers. Members of "Bike for a Better City" think that if there are bike roads, more people will ride bikes to work. They are working hard for this thought.

But there aren't any bike roads now. In the city, not everyone thinks it is a good idea to build bike roads because it costs much money and time. And car drivers don't like the idea, either. Because many people live too far away from their working places, they can't go to work by bike.