the 21st century changes The 21st will bring many changes. Some of the biggest changes of this century will be in the area of Information and communication technology. However, air pollution will be a big problem. More significantly, we feel the shortage different kinds of energy. No wonder, communication technology is one of the most important necessities of human life. Modern technology has brought great benefits to human life. On of the important Inventions of mankind is internet. It make us feel connected all over the world. This achievement is an outstanding example of enoremous invention of 21st century. Wide varieties of works can be done by using the internet. We will not have to go stores to purchase our necessities or go to a store to buy a book. All these buying are being done by internet and other communication devices like mobile phones. However, as a result of human activities, we will be encounterd air pollution problems. It is really a big problem. Factories release toxic materials into air and discharching waste water into rivers. With no doubt. people's health will be affected by these pollutions. Ozones layers that protect life on the earth form the danger of strong UV and X-rays are being destroyed. Alhtough, standard of living of people is getting better than before, destroying natural resources should not be understimated. Moreover, oil prices are keep rising that could trigger economim crisises. Human need more and more energy than before. Most industries, need oil as a primary material. Powe plants use natural gas to generate electricitey. On the other hand, We use them as a source to heating, cooking and other works. If the prices keep rising continuously, in the future we will definietly be the witness of negative impact on the economy of the world. Numerous indusries will cut off employee. In other words, undoubtedly we will be faced a big economic crisis in the future. In summary, taking into account all these factors although 21st century bring aboue many advantages, we can not forget the the problems mentioned in the passage.