Are skyscrapers good or not

In my opinion, building skyscrapers is a good thing for some cities which have over population and pollution problems. Although skyscrapers require huge money and steel, they also bring some benefits.
First, skyscraper which are new design can solve lack of land. They can provide more space for people to live, work, and relax. Many cities have skyscraper such as NewYork, Beijing, and Tokyo. Most of these cities have common problem: lack of land. For example, in Tokyo, they plan to build the sky city to replace all building. All people live in the skycity which has school, working place, medicine center, entertainment and so on. This is a excellent idea to design our city.
Second, skyscrapers can reduce pollution. On one hand, skyscraper can save land to build trees, parks, and greenlines that work for refreshing air. On the other hand, some skyscraper have unique design to reduce pollution. For instance, green building use at least 35% less energy. The building act as a giant air filter, and it can suck in dirty air from city, clean it up, and send it out cleaner.
Last but not least, skyscrapers are financial and national symbol of cities. In the other word, city which have the highest skyscraper expresses its status. Also, some cities are famous by their tallest building.
For those reasons, I consider that skyscrapers have more positive effects in the future.