Pollution prevention, also known as P2, happens when people change their plans, practices and habits in order to reduce the generation of pollution and waste at the source, instead of trying to clean it up after the fact. Pollution prevention also includes activities that protect natural resources (i.e. trees, water) through conservation or more efficient use of resources.

The key to environmental sustainability is thinking globally and acting locally. Pollution prevention is about making smart choices–both in what we buy and in how we use products. It involves looking at the causes of waste and pollution and figuring out how to prevent them.
Due to the number of people in attendance and the many activities taking place throughout the day at a school, larger quantities and more types of waste are produced at schools than in homes. Students, administrative staff, teachers, janitors, and contractors all use energy, water, and even hazardous chemicals, throughout the school year. Therefore, schools are a great place to introduce pollution prevention (P2) ideas on how to reduce or eliminate pollution and waste, which can be harmful to humans and the environment and costly to school budgets.

Where is waste generated in schools?
Energy: used in lighting, office machines, heating, air conditioning, transportation
Hazardous chemicals: found in cleaning supplies, aerosol cans, paints, science labs (mercury), art classrooms, janitors' storerooms
Pesticides: used on school grounds, gyms, kitchens, locker rooms
Water: used in bathrooms, kitchens, locker rooms, sinks in classrooms, outdoors

How can your school prevent pollution?
All students, teachers, administrators, and janitors should ask themselves if there is a better way to do their job–a way that will not create waste. In other words, everyone at the school should adopt a "less is best" attitude.

Some ways that students, teachers, and school administrators can prevent pollution at school include the following:

Bike, walk, or share rides to and from school.
Request that drivers of school buses and cars turn off their engines while they wait to pick up or drop off students.
Use less toxic glues, paints, markers, and other materials.
Start a book exchange.
Collect unused school supplies at the end of the year for reuse next year.
Buy unbleached, recycled paper.
Organize a tree-planting event on school grounds, or organize a school-ground naturalization project to create opportunities for outdoor learning through hands–on experience.
Use both sides of paper.
Take a "litter-less" lunch to school, by using reusable containers and a re-usable lunch bag.
Use refillable pens, printer toners, and ribbon cartridges.
Turn off machines when they are not in use.
Organize a paper, glass, plastic or metal recycling project.
Eliminate the use of pesticides and chemicals on the school playing fields.
Encourage students to implement pollution prevention principles that they have learned at school in their homes.
Form a pollution prevention team.
Celebrate Environment Week and participate in a community event.

@Nguyễn Trần Thành Đạt

1Many pollution prevention opportunities are available to schools. Below is a list of some things schools can do:

Purchase less toxic cleaning supplies. Use double-sided copies. Set all computers to print double sided. Join the Clean Air Zone Program and actively encourage parents to adhere to the signs by no idling. Use energy-efficient fluorescent lights and properly recycle them when they are spent. Start an alternative transportation program at school to encourage biking, walking, or carpooling. Turn off lights when not in use. Use recycled products and other environmentally friendly products. Plug holes and caulk windows to stop heat loss. Lower the thermostat during unoccupied hours. Turn off all machines when not in use. Fix leaks in faucets and pipes. Only run the dishwasher when it is full. Use water-efficient and native landscaping. Water school grounds in the morning or in the evening to prevent evaporation. Do not over water. Use a minimal amount of fertilizers and pesticides and follow directions. Find natural alternatives if possible. Use non-chemical pest control methods such as swatters for insects and mechanical traps for mice. Use integrated pest management. Start a Chemical Roundup Program to properly dispose of old and potentially hazardous materials and prevent the accumulation of chemicals in the future.

2.Mobile phone is a good technology which is not lacking from our lives. This report will discuss the advantages and disadvantages of using mobile phones.

Today, mobile phone has become popular to everybody [This is an over-generalization: many people do not like them. Use "most people" or something similar] since it is very convenient. The most advantage of having a mobile phone is you can communicate to your family and your friends no matter what where you are. For instance, you can contact easily to your friends by calling or sending messages everywhere without electricity. It is maybe the main reason why almost all [good, but still, is it true?] people today choose to own a mobile phone. From the customer’s point of view, it is obvious that mobile phones assist you in business a lot, such as, make schedule of working, surf the internet, and keep in touch with their companies. Moreover, you can relax with mobile phone’s applications, for example, play games, listen to music, or chat with your friends.

On the other hand, there are also disadvantages. Using a lot mobile phone can harm your brain, particularly teenager and children who are under 16 years old. If you use mobile phones too much, you will get bad effects like dizzy, blood-brain barrier [the blood-brain barrier is simply the normal anatomical barrier between the bloodstream and the brain; it's not a condition] , or ears problems. In addition, when you use mobile phones while you are driving, you will get an accident. It is essential not good for you and others. Moreover, “radiations emitted from the phone are dead harmful for the eardrum”, has proved by many scientist.
[You haven't discussed the irritating effect on other people in restaurants, buses etc. from users shouting down their phones].

Owning a mobile phone in your hand is you can solve many issues and hold most of information around the world. Even though is not good for your health and you have to protect yourself from bad effects of mobile phones if you choose to have one.

TOPIC 3

Mobile phone is a good technology which is not lacking from our lives. This report will discuss the advantages and disadvantages of using mobile phones.

Today, mobile phone has become popular to everybody since it is very convenient. The most advantage of having a mobile phone is you can communicate to your family and your friends no matter what where you are. For instance, you can contact easily to your friends by calling or sending messages everywhere without electricity. It is maybe the main reason why almost all people today choose to own a mobile phone. From the customer’s point of view, it is obvious that mobile phones assist you in business a lot, such as, make schedule of working, surf the internet, and keep in touch with their companies. Moreover, you can relax with mobile phone’s applications, for example, play games, listen to music, or chat with your friends.

On the other hand, there are also disadvantages. Using a lot mobile phone can harm your brain, particularly teenager and children who are under 16 years old. If you use mobile phones too much, you will get bad effects like dizzy, blood-brain barrier , or ears problems. In addition, when you use mobile phones while you are driving, you will get an accident. It is essential not good for you and others. Moreover, “radiations emitted from the phone are dead harmful for the eardrum”, has proved by many scientist.
Owning a mobile phone in your hand is you can solve many issues and hold most of information around the world. Even though is not good for your health and you have to protect yourself from bad effects of mobile phones if you choose to have one.

TOPIC 4: What are the advantages and disadvantages of science and technology?

Bài làm

Today, the agricultural revolution, the renaissance, the industrial revolution, the information age are each composed of innumerable individual advances in science & technology. There are obvious advantages of technologythe such as:
- Life is become easy and comfortable through science and technology.
- Travelling has become easy and fast in minutes.
- Communication is become easy, fast and cheaper.
- Standard of living have increased with the increase in technology.
- Human have become advanced by using various new technology.
- Due to the development in the science and technology impossible have become possible.
- Difficult thing and work have become easy and comfort to man due to science and technology.
- Life has become easy and stable.
But there are obvious disadvantages of technologythe such as:
- Human had misused the technology and used in destructive purpose.
- Human is doing illegal things by using it.
- New Technology like mobile, I-pad,.. etc. are creating bad effect on children.
- Terrorist are using modern technology for their destructive work.
- Due to the development of atomic energy and atom bomb create many harmful diseases like skin disease etc.
- Heart disease, brain disease are caused due to the vibration of the mobile phone.
- Modern technology have not only affected man only but it also affected plants and creatures also due to nuclear energy.
- Due to the development of modern technology natural beauty is decreasing.

The above are some advantages and disadvantages of science and technology.

TOPIC 1: Many famous places in the world, talk about the place you would like to visit

There are many famous places in the world but I'd like to visit Canada. I've dreaming to visit there for more than 2 years . Canada has a lot of picturesque landscape and it also has a varied culture. Canada boasts that it's one of the most beautiful contries in the world. For example, Vancouver located right on the ocean and there are enormous snow-tipped moutains surrounding the entire city. There is a multitude of beautiful park to walk through and very nice beaches. Besides, all across the country there are small picturesque towns located on mountains and valleys. In general, Canada is an incredibly clean country, which also helps its beauty. Another reason I want to go there is to attend one of the universities there for my bachelor's degree. I think that would be an excellent idea to go seeing the school and perhaps even meet some of the professors that teach the course I'm interested in. It would be benefical for me to meet other students.

- talk about the ways of reducing pollution at your school

Environment is an essential part of our life. A clean environment is necessary for a peaceful and healthy life. An environment is the natural surroundings which helps human beings, animals and other living things to grow and develop naturally. But nowadays, our environment is disturbing in many different ways. Any type of disturbance in the nature’s balance affects the environment totally. It does not only ruin human lives but also affects on all living beings. We can save our environment with the little step taken by everyone on the earth. We should reduce the amount of waste, throwing wastes properly to its place only…and many other simple ways. It is very important to save environment for human existence. When we protect the environment, we are protecting ourselves and our future as well.

- What are the advantages or disadvantages of using mobile phone

Smart phone has played a very important role in our lives. It is an useful entertaining instrument. We can download a lot of games or books, music, movies and they are free. After a stressful working day, this will be a good way to relieve stress and get back energy. In addition, the phone is also considered one of the modern educational methods. Only with the phone connected to the Internet, we can access and surf the web to enlarge knowledge. On the Internet there are a lot of different knowledge from literature, theology, history, physics to astronomy and politics. Moreover, there are also a number of other helpful news channels, which helps us broaden our knowledge of cooking, fashion, behavior in communication, ... Last but not least, because of the compact , being easy to carry so the phone is loved by almost people. We can take it to anywhere and use it any time. In short, the phone offers a lot of great benefits. Each of us should use it reasonably and efficiently.

talk about the ways of reducing pollution at your school

Our school looks so dirty these days. And it's time to save our school before it's too late. There are many ways of protecting the environment at our school.

Firstly, we should reduce and reuse bottles, cans and plastic bags because they are hard to dissolve. If we do so we can save energy and even make more money from selling those things.

Secondly, we shouldn't throw trash on the school ground because it doesn't only cause pollution but also do harm to our health and make us get sick.

Thirdly, we should make sure our lunch table is clean before we leave. Don't leave milk cartons, napkins or pieces of food on our table. Push in our chairs as we leave the table and remember to check the floor to make sure we didn't drop anything.

Finally, we should go to school by bike, on foot , or public transport to reduce exhaust fumes and save energy.

In conclusion, reducing pollution at our school means that we are improving the quality of our study time.

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TKTK :
Raise people's awareness, garbage according to regulations, do not litter. Limit the use of detergents through drains. Completing the systematic law on environmental protection and anti-pollution. Building a system management environment according to international standards