79 Population Growth
The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the contrary, demographic history offers evidence that population growth has not been at all constant. According to paleoecologist Edward Deevey, the past million years show three momentous changes. The first, a rapid increase in population around one m illion B. C., followed the innovations of tool making and tool using. But when the new power from the use of tools has been exploited, the rate of world population growth fell and became almost stable. The next rapid jump in population started perhaps 10,000 years ago, when mankind began to keep herds, plow and plant the earth. Once again when initial productivity gains had been absorbed, the rate of population growth abated. These two episodes suggest that the third great change, the present rapid growth, which began in the West between 250 and 350 years ago, may also slow down when, or if, technology begins to yield fewer innovations. Of course, the current knowledge revolution may continue without foreseeable end. Either way - contrary to popular belief in constant geometric growth - population can be expected in the long run to adjust to productivity. And when one takes this view, population growth is seen to represent economic progress and human triumph rather than social failure.
2014年英语四级写作必备范文:非物质文化遗产
2015年6月英语六级写作预测(4)
2014年英语四级写作必备范文:西方节日盛行
2015年英语六级作文范文:研究生热
2015年6月英语六级作文范文预测(2)
2015年6月英语六级作文范文预测(1)
英语四级作文写作佳句(8)
2015年6月英语六级作文范文预测汇总9篇
2014年英语四级写作范文参考:网上购物
2015年大学英语四六级写作之必备谚语(A)
2015年6月英语六级作文范文预测(9)
2015年英语六级作文范文:性教育
2014年大学英语四级作文模板:评论反驳类
2014年英语四级写作备考指导
2015年英语六级作文范文52篇
2015年大学英语四六级写作之必备谚语(C)
2015年6月英语六级写作常见错误分析(8)
2015年大学英语四六级写作之必备谚语(D)
2015年6月英语六级作文常见错误汇总
2015年6月英语六级写作常见错误分析(13)
2015年6月英语六级写作常见错误分析(2)
英语四级作文写作佳句(14)
2015年6月英语六级写作常见错误分析(6)
2015年6月英语六级写作常见错误分析(9)
2015年英语六级作文范文:创新能力
2015年6月英语六级写作常见错误分析(1)
2014年英语四级作文万能句式:批驳举例证明类金句
2015年6月英语六级作文范文预测(5)
2015年6月英语六级写作常见错误分析(7)
2015大学英语六级作文模板:结尾很重要
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |