誓言&公主
[學(xué)長(zhǎng)]
look at your watch for just one minuite.During that time,The popuiation of the world increased by 259.Perhaps you think that is notmuch.Hoever,during the next hour,over15540 more babies will be born on the world.
So it goes on,hour after hour.In oneday,people have to produce food fover 370000 more mouths.Multiply this by365.justthink how many more there will be in one year!What will happen in a hundred years?
The increasing population
may be the greatest challenge of the world today.The world's population is growing faster and faster.Two thousang years ago,there only 250millon people on the earth.At the beining of the20thcentury,the world'spopulation was about 1.7billion.In 1990,it reached more than five billion.Now at the beininjg of the 21stcentthe world's population has passed six billion.people say that by the yeay 2010it may be seven billion.That means in about 600 years,there will br standing room only on the earth.Each person will have one half to one square metre of space to live in.There will be hardly enough space ror angbody else.