They are exaggerating of course. But the situation is grave. We must do our best to make the world better for us to survive. We can find new things, such as solar energy to replace the energy sources being used today .With the help of science, we can also find new methods to protect people`s health. And new ways can be carried out to prevent the pollution and control the population. In a word, we must not be afraid of the problems and be anxious all the time. It `s our turn to act actively to make the situation better to survive.

Should Firecrackers Be Banned?
Some people think that setting off firecrackers is a good thing. They say that it is an ancient Chinese custom which should be preserved. They also claim that firecrackers make festivals and holiday occasions more colorful and entertaining for both adults and children.
On the other hand, there are many people who say that firecrackers should be banned. They point out that firecrackers are responsible for fires which destroy property, and for injuries and burns suffered both by the people who set them off and by innocent bystanders. They also say that firecrackers are a waste of money and resources.
My own point of view is that we should preserve the old custom of setting off firecrackers, while at the same time making them harmless. We can do this by banning firecrackers from public places. In addition, we should restrict the setting off of firecrackers to festival days.
Do "Lucky Numbers" Really Bring Good Luck?
There are people who believe that some numbers bring good luck, while others bring bad luck. For instance, in China number 8 is thought to be lucky. Turning our attention to the west, we find that the number seven is considered lucky, but the number 13 is avoided like the plague.