科技英语在线,谁会这些题目,I spent some of the most exciting days of my life working on the eastern shores of Kenya’s Lake Turkana,searching for the fossilized remains of our early ancestors.We did not always find what we wanted,but ever

科技英语在线,谁会这些题目,I spent some of the most exciting days of my life working on the eastern shores of Kenya’s Lake Turkana,searching for the fossilized remains of our early ancestors.We did not always find what we wanted,but ever
科技英语在线,谁会这些题目,
I spent some of the most exciting days of my life working on the eastern shores of Kenya’s Lake Turkana,searching for the fossilized remains of our early ancestors.We did not always find what we wanted,but every day there was much more to discover than the traces of our own predecessors.The fossils,some quite complete,others mere fragments,spoke of another world in which the ancestors of many of today’s African mammals roamed in the rich grassland and forest fringes between 1.5 million and 2 million years ago.The environment was not too different from the wetter grasslands of Africa today,but it was full of amazing animals that are now long extinct.
One in particular I would have loved to see alive was a short-necked giraffe relative that had huge “antlers”,some with a span across the horns of close to almost 3 meters.There were buffalo-size antelopes with massive curving horns,carnivores that must have looked like saber-toothed lions,two distinct species of hippo and at least two types of elephants.We may never know the full extent of this incredible mammalian diversity,but there were probably more than twice as many species a million years ago as there are today.
That was true not just for Africa.The fossil record tells the same story everywhere.Most of life’s experiments have ended in extinction.It is estimated that more than 95% of the species that have existed over the past 600 million years are gone.
So,should we be concerned about the current spasm of extinction,which has been accelerated by the inexorable expansion of agriculture and industry?Is it necessary to try to slow down a process that has been going on forever?
I believe it is.We know that the well-being of human race is tied to the well-being of many other species,and we can’t be sure which species are most important to our own survival.
But dealing with the extinction crisis is no simple matter,since much of the world’s biodiversity resides in its poorest nations,especially in Asia,Africa and Latin America.Can such countries justify setting aside national parks and nature reserves where human encroachment and even access is forbidden?Is it legitimate to spend large sums of money to save some species — be it an elephant or an orchid — in a nation in which a sizable percentage of the people are living below the poverty line?
Such questions make me uneasy about promoting wildlife conservation in impoverished nations.Nonetheless,I believe that we can — and should — do a great deal.It’s a matter of changing priorities.Plenty of money is available for scientific field studies and conferences on endangering species.But what about boots and vehicles for park personnel who protect wildlife from poachers?What about development aid to give local people economic alternatives to cutting forests and plowing over the land?That kind of funding is difficult to come by.

科技英语在线,谁会这些题目,I spent some of the most exciting days of my life working on the eastern shores of Kenya’s Lake Turkana,searching for the fossilized remains of our early ancestors.We did not always find what we wanted,but ever
我花了一些最令人兴奋的日子,我的生活在东部海岸的肯尼亚卡那湖,寻找化石的早期祖先.我们并不总能找到我们需要的东西,但是我们每天都有更多的发现自己的痕迹.这些化石上,一些相当完备,别人说话仅仅碎片,另一个世界,他们的祖先在今天的非洲哺乳动物在丰富的草原和森林边缘150万之间,2万年前.环境是不太不同于潮湿的非洲草原上,但它是充满了令人惊奇的动物正在长灭绝.
一个特别的,我也愿意看到活着是长颈鹿有巨大的“相对”,另一些可以在坛的四角跨度几乎3米的接近.有buffalo-size羚羊和巨大的弯曲角、食肉动物,必须看起来像saber-toothed狮子,两种不同种类的河马,至少有两种类型的大象.我们不知道这难以置信的哺乳动物多样性,但有可能超过两倍的物种百万年前就有今天.
那是真的不只是为非洲.化石记录中讲述着同样的故事随处可见.大多数的实验已经结束了在灭绝.据估计,有超过95%的物种存在过去六亿年间已经一去不复返了.
所以,我们应该关心当前的痉挛,它已经灭绝的加速的必然扩展农业和工业?是否有必要试图放慢过程,这已经永远?
我认为这是不对的.我们知道,人类的幸福和许多其他物种的幸福,我们不能肯定哪个物种是最重要的,我们自己的生存.
但处理灭绝危机不是件简单的事情,因为世界上大部分的生物居住在其贫困的国家,尤其是在亚洲、非洲和拉丁美洲.可以这样的国家证明留出国家公园和自然保护区,在人类的侵犯,即使进入禁止吗?它是合法的花费大笔的钱来挽救某些物种是大象和兰花—在一个国家中相当比例的人生活在贫困线以下吗?
这样的问题使我担心促进野生动物保育在贫困的国家.虽然如此,我相信我们能做的——如果——一笔好交易.重要的是变化的优先权.大量的资金用于科学研究领域的研究和会议的危害物种.但靴子和车辆公园人员保护野生动物从盗猎者吗?如何开发援助给当地居民经济替代切割森林和耕作土地吗?这类基金是困难的.
问题是什么?