世界人口密度不断加大，越来越多的人口带来的压力也随之增加。专家认为，我们正在逼近地球所能承受的人口极限，因此我们必须控制人口生育。也有人认为如果用计划生育来强行控制人口数量，会危及人类未来的繁衍。权威人士认为高智商人群更可能生育较少的孩子，而由此导致人类整

American Businessmen frequently use social situations to make business deals. One of the best examples of this practice is the business lunch. It is used to win clients, to make influential contacts, to discuss and settle internal disagreements, and even to interview potential employees. Some companies always conduct job interviews over lunch. A business lunch usually lasts from one to two and half hours, and it often takes place at a restaurant with a pleasant, quiet atmosphere conducive to private discussions.

As the world population becomes denser, we will feel greater pressure from the expanding number of people. Some experts argue that we are approaching the limit of the number of people the earth can support adequately and they feel we shall turn to compulsory birth control. Other authorities feel that if birth control is imposed on the population, the future of mankind will be seriously endangered. They think intelligent people will be more likely to have fewer children, which will bring about a lowering of the level of intelligence.