Many people say the world is becoming a more dangerous place. In almost every area of the world, something bad is happening. Many countries are having political problems. Some are fighting wars with their neighbors. In others, people are making trouble against their own government and fighting wars. Terrorists are taking hostages and hijacking planes (劫机) to make demands on their government or on the government of another country. Some countries are violating (侵犯) the human rights of some of their citizens. People in those countries as well as in other countries are against the government. Besides political problems, there are also economic problems. In some countries, there is not enough food, and people are starving. In other countries, such as the U. S., unskilled workers are losing their jobs as technology keeps increasing. There are also many social problems. In the U. S., for example, more and more people are getting divorced, and the children are growing up in single-parent families. Many young women are having babies without getting married. More and more young people are suing drugs. What is the main idea of the passage