Many people have cars in the city. But (污染) is a problem because of the cars. Nowadays some downtown(闹市区的) areas around the world don't have cars. These car-free zones(无车区) are areas for people, bicycles and (公共的) transportation only. Eight million people   (居住) in the center of London and another two million people go to work there every day. The downtown area is very (吵闹的) with hundreds of cars, buses and taxis, but there are (也) a lot of beautiful parks with free music concerts. Many people go there for a rest (在……之后) they get off work. Parts of Tokyo are always crowded with hundreds of people- but no cars! These modern car-free zones are (真正地) popular and people like shopping there. In the past, Bogota was polluted (因为) there were lots of cars and traffic. Now the downtown area is a car-free zone and the air is (干净的)! Many people don't have a car and half a million people take the bus to work. There are lots of stores. It's not (昂贵的).

The witch the prince a frog.

    What does it mean to be green? "Green" is more than a color. It also means taking special steps (protect) the environment the water, the land, and the air we breathe. (plant) are green, and without them the earth wouldn't be such a lovely home for us human beings.

    Sometimes people, call our society a "throwaway society". That means we are throwing away old things and (buy) new ones. Many times, if you no longer need something, others just might need it. For example, if you are old enough not to play your toys, why not give them to another family has a kid so that he doesn't need to buy new toys? And there will be less rubbish in your neighborhood.

    In order to keep the neighborhood "green" and make waste become renewable resources, the government of Chengdu encourages people to pack (they) rubbish with garbage classi-fication (垃圾分类), then send it to the bank of "junk". The bank of "junk" gives marks to every household according the types of waste, and if they do better in this way, they can get some daily (use) things.

    Through the bank of "junk", not only can a lot of rubbish be changed into recycled resources, and people can get many benefits (益处), but the people can develop habits of reducing rubbish and living (healthy).

He went to school staying at home.

Bob: Good morning, Kim.

Kim: Good morning.

Bob: Why don't you drive to work? It can a lot of time.

Kim: Well, I walking to driving a car.

Bob: Mm, it's good for health and the environment.

Kim: Yes. The environment is very important to us. Everyone should do something for it.

Bob: Yeah, right. What else can we do?

Kim: For example，we'd better not buy clothes of animal fur.

Bob: I agree with you. It's a good way to protect animals. Anything else?

Kim: Don't use bags.

Bob: But don't you think they are really convenient in our daily lives?

Kim: Yes，they are really useful. But they our environment.

Bob: How can we carry things after shopping?

Kim: We can use cloth bags instead of plastic ones.

    How do you deal with plastic bags from the supermarket? Throw them away or recycle them? How about eating them?

    The bags are not harmful to the environment. Humans and animals can safely eat them. Indian company EnviGreen has made a bag with natural materials. It looks and feels just like plastic, but can be broken down(分解) easily.

    Ashwath Hedge who set up the EnviGreen company spent four years doing experiments (实验) with 12 natural materials. They include potatoes, corn, vegetable oil and bananas. He made the materials into liquid(液体) and used the liquid to make the bag.

    Although the EnviGreen bag is more expensive than a common plastic bag, it has many advantages. According to The Wall Street Journal, it takes 1,000 years for common plastic bags to break down. But an EnviGreen bag can naturally break down in less than 180 days. It also breaks down in less than a day in water, and in less than a minute in boiling water. Hedge was happy to show it in his interview, and he put an EnviGreen bag in water and ate it with a smile.

    There are more than 15,000 tons of plastic waste in India every day. But only 9,000 tons are processed. In China, 3 billion plastic bags are used

    Every day. Maybe the EnviGreen bag could be a solution to the world problem of plastic pollution,