【正文】 the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. So how high will the temperature increase go? Dr Janice Foster says that over the next 100 years the amount of warming could be as low as 1 to degrees Celsius, but it could be as high as 5 degrees. However, the attitudes of scientists towards this rise are pletely different. On the one hand, Dr Foster thinks that the trend which increases the temperature by 5 degrees would be a catastrophe. She says, “We can’t predict the climate well enough to know what to expect, but it could be very serious.” Others who agree with her think there may be a rise of several metres in the sea level, or predict severe storms, floods, droughts, famines, the spread of diseases and the disappearance of species. On the other hand, there are those, like Gee Hambley, who are opposed to this view and believe that we should not worry about high levels of carbon dioxide in the air. They predict that any warming will be mild with few bad environmental consequences. In fact, Hambley states,” More carbon dioxide is actually a positive thing. It will make plants grow quicker。 crops will produce more。 it will encourage a greater range of animals – all of which will make life for human beings better.” Greenhouse gases continue to build up in the atmosphere. Even if we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to keep on warming for decades or centuries. No one knows the effects of global warming. Does that mean we should do nothing? Or, are the risks too great? WHAT CAN WE DO ABOUT GLOBAL WARMING? Dear Earth Care, I am doing a project on behalf of my school about global warming. Sometimes I feel that individuals can have little effect on such huge environmental problems. However, I still think people should advocate improvements in the way we use energy today. As I’m not sure where to start with my project, I would appreciate any suggestions you may have. Thank you Ouyang Guang Dear Ouyang Guang, There are many peopleheart and lungs or that it was more difficult for smoking couples to bee pregnant. I certainly didn’t know their babies may have a smaller birth weight or even be abnormal in some way. Neither did I know that my cigarette smoke could affect the health of knownsmokers. However, what I did know was that my girlfriend thought I smelt terrible. She said my breath and clothes smelt, and that the ends of my fingers were turning yellow. She told me that she wouldn’t go out with me again unless I stopped! I also noticed that I became breathless quickly, and that I wasn’t enjoying sport as much. When I was taken off the school football team because I was unfit, I knew it was time to quit smoking. I am sending you some advice I found on the Inter. It might help you to stop and strengthen your resolve. I do hope so because I want you to live as long and healthy a life as I have. Love from Grandad How can you stop smoking? It is not easy to stop smoking, but millions have managed to quit and so can you. Here are a few suggestions. Prepare yourself. Decide on a day to quit. Don’t choose a day that you know is going to be stressful, such as the day of an exam. Make a list of all the benefits you will get from stopping smoking. Then throw away your last packet of cigarettes. Be determined. Every time you feel like smoking a cigarette, remind yourself that you are a nonsmoker. Reread the list of benefits you wrote earlier. Break the habit. Instead of smoking a cigarette, do something else. Go for a walk, clean your teeth, drink some water, clean the house。 in fact, do anything to keep your mind and especially your hands busy. Relax. If you start to feel nervous or stressed, do not reach for a cigarette. Try some deep breathing instead. Do some relaxation exercises every time you feel stressed. Get help if you need it. Arrange to stop smoking with a friend so you can talk about your problems, or join a stopsmoking group. If you feel desperate, you might lie to talk to a doctor or chemist about something to help you, like nicotine chewing gum. Keep trying. Do not be disappointed if you have to try several times before you finally stop smoking. If you weaken and have a cigarette, do not feel ashamed. Just try again. You will succeed eventually. HIV/AIDS。 ARE YOU AT RISK? HIV is a virus. A virus is a very small living thing that causes disease. There are many different viruses, for example, the flu virus or the SARS virus. HIV weakens a person’s immune system。 that is, the part of the body that fights disease. You can have HIV in your blood for a long time, but eventually HIV will damage your immune system so much that your body can no longer fight disease. This stage of the illness is called AIDS. If you develop AIDS, your chances of survival are very small. HIV is spread through blood or the fluid that the body makes during sex. For a person to bee infected, blood or sexual fluid that carries the virus, has to get inside the body through broken skin or by injection. One day scientists will find a cure for HIV/AIDS. Until that happens, you need to protect yourself. Here are some things you can do to make sure you stay safe. If you inject drugs: do not share your needle with anyone else. Blood from another person can stay on or in the needle. If a person has HIV and you use the same needle, you could inject the virus into your own blood. do not share anything else that a person has used while injecting drugs. Blood could have spilt on it. If you have sex with a male or a female: use a condom. This will prevent sexual fluid passing from one person to another. The following statements are NOT true. A person cannot get HIV the first time they have sex. WRONG. If one sexual partner has HIV, the other partner could bee infected. You can tell by looking at someone whether or not they have HIV. WRONG. Many people carryi