8.What are the main problems facing big cities?
Generally speaking most people in the world live in big cities. Some of them say that it is comfortable and they are happy because of living in such a city. The other say that living in a big city has many disadvantages. I think that living in a big city is more comfortable than in a small town. When you live in a big city you can go to the cinema. There are a lot of cinemas in such cities. You can go to see movies you like the most. It is also possible to choose the most comfortable cinemas which offer very good quality of sound and video. You can also go the museum and even to the opera house. If you do not like culture you can go to pubs, there are a lot of pubs where you can meet with your friends. People who live in a small town cannot go to the cinema, they only can watch television. There are also only few places where they can meet and talk with friends. Living in a big city seems to be perfect but it has some disadvantages. It is dangerous to go for a walk at night because you can be robbed or even killed.
Our world is changing rapidly. The progress of our civilization made in last two hundred years is enormous. There are changes in every part of life, in science, industry, agriculture, medicine, culture and the way of life. However, we are still facing a lot of problems which have not been solved yet. Many of them refer to our environment. People have a huge influence on air, soil, water, animals and the other elements of the environment. Unfortunately, only few people understand that we are an integral part of it and need to protect it if we want to exist. Human race is so powerful that it can destroy life on the earth not only by using nuclear weapons but also by irreversible damages made to the environment. The biggest threats are: holes in the ozone layer, greenhouse effect, pollution, radioactive waste, acid rains, deforestation.
Nowadays, every newspaper, radio or TV gives us a lot of news connected with environment degradation. We often hear about greenhouse effect, deforestation, pollution and ozone hole. Our planet is full of dust and dirt. People have built a lot of factories, power plants and many other things which pollute the air. Each year a large amount of carbon dioxide and many other harmful gases are released into the atmosphere. They cause acid rains, pollution and greenhouse effect.