关于人口的英语演讲稿怎么写？

参考一

   In industrialized countries, the number of people reaching retirement age is growing, while the number of working age people is declining。The number of people aged 80 and older is growing at a faster rate than any other age group worldwide。 By the year 2050, there will be almost twice as many older non-working people than there are now, in contrast to the total number of workers。 

   In 1950, there were 12 people of working age for every person age 65 or older。 In 2010, there are only 9 contributing to old age support in their countries。 That means that here in the U。S。, fewer people are contributing to Social Security and Medicare in proportion to the number of people needing and using those programs。 

   EarthSky spoke with Carl Haub, a demographer at the Population Reference Bureau, a Washington D。C。- based think-tank, about why the population is getting older。 He said it’s because couples are having fewer children, on average。

   Carl Haub: If a couple has two children themselves, then they basically replace themselves。 But if they have 1。2 or 1。3 or 1。4, every succeeding generation gets smaller and smaller。

   Haub said that some governments, such as Spain and Russia, have offered couples incentives to have more children。

   Carl Haub: It’s quite a phenomenon, in world history。 We’ve never seen this before。

参考二

  　From nowadays, the world have more and more people, somebody say that when in 2015, the population of the world will achieve  about 70 billion。 General to say, developing country have much more population  and increase than the advance country。 The population have brouht many seniors problem ,for example :traffic jams，pollution of the environment，the resources are not enough for us,and so on。。。。The populations problem is to become the most serious probelm of the worlds。Therefore,control the population are the  one of the biggest problem of the worlds。

参考三

   Everything grows in modern times, and it seems that nothing grows as quickly as population。 Population keeps growing, and grows rapidly, firstly because people's living standards keep going up, with better houses, better clothing, better food, secondly because people know how to preserve themselves so as to live longer, and thirdly

　　because they have modern medicine and medical care to ensure that usual diseases can be easily cured。 There is another cause for the growth of population。 Few countries or governments have realised the importance of family planning。 On the contrary, some encourage child-birth。

　　Here are some examples of population growth from 1985 to 2000 (as anticipated)。

　　Lima had 5。7 million people in 1985 but there were 9。1 million by 2000。 Tianjin used to have 7。 9 million in 1985。 By 2000 its population reached 9。 7 million。  Such cities as London, Osaka, Moscow, Beijing, Karachi, Delhi, Jakarta, Seoul, and Teheran are having a similar population growth。 We would not be shocked if all other cities have this rate。 But some cities, like Calcutta, Shanghai, New York, and Sto Paulo boost their population even more quickly than the above-mentioned cities。 Tokyo had 18。8 million in 1985。 The year 2000 found 20。2 million Tokyo citizens。 Mexico city had 17。3 million people in 1985, but as population specialists had predicted, that reached 25。8 million in 2000 !

　　The population problem is a universal concern nowadays。 Any government is a failure if it does nothing about its population growth。