论文部分内容阅读
大约在20万年前,人类才出现在地球上。一万年前,地球上的人口不足1000万。现在,世界上的总人口数已经有70多亿。为什么人口会如此迅猛地增加?未来,地球上是否会人满为患?这甚至关系到了人类的未来命运。关于人口的增长,也许有很多令你吃惊的数据。令人惊讶的世界人口和平均寿命看过《疯狂原始人》的同学也许还记得这么一幕:原始人咕噜一家本来有很多邻居,但是很不幸地是,他们的邻居有的被踩死了,有的被蛇咬死了,有的被怪物吃掉了,有的感冒病死了,所以只剩下了咕噜一家人存活了下来……这就是原始人
About 200,000 years ago, humanity appeared on Earth. Ten thousand years ago, the population on Earth was less than 10 million. Now, the total population in the world has more than seven billion. Why the population will so rapidly increase? The future, the Earth will be overcrowded? This is even related to the future destiny of mankind. There may be a lot of surprises about population growth. Amazing world population and average life expectancy seen “crazy primitive” classmates may still remember such a scene: the original grunt family had many neighbors, but unfortunately, some of their neighbors were killed, there are Was killed by a snake, and some were eaten by monsters, and some died of a cold, so only a family of survivors of Gollum survived ... This is the primitive