Environment and Sustainable Development 2

第二讲当代资源与环境问题

北京石化学院

主要内容

1 当代资源(水资源、土地资源、能源、矿产资源)短缺

2 全球环境问题(气候变化、臭氧层破坏、生物多样性锐减、海洋污染等)

1 当代资源短缺

水资源、土地资源、能源、矿产资源

1.1当代资源短缺—水资源短缺

1.1.1 全球淡水资源短缺状况

?地球水总量(tw)不小,但全球淡水资源(fw)储量很小,仅占全球总水量的0.3%,约为400km3左右

–主要是河流水、湖泊水和地下水

?陆地淡水资源分布不均,人均及单位面积土地的淡水(pfw)占有量不尽相同

–譬如:北非和中东许多国家(埃及、沙特阿拉伯等)降雨量少、蒸发量大,因此径流量小,pfw都很少;冰岛、厄瓜多尔、印尼等

国,以每公顷土地计的径流量比贫水国高出1000倍以上?1998年3月19-21日法国巴黎部长级关于水资源会议,探讨了水资源与可持续发展的关系:

–世界水资源研究所认为,全世界26个国家2.32亿人口已面临缺水,4亿人口用水的速度超过水资源更新速度,世界上约有1/5人口得

不到符合卫生标准的淡水

–世界银行认为,占世界40%的80多个国家在供应清洁水方面有困难

–其他研究预计,在20-30a内,淡水拥有量不足的人口达15亿。?中东地区(沙特阿拉伯、也门、阿曼、阿联酋、巴林、科威特、以色列等国)水资源奇缺

–从河流分布看,没有大流量的江河湖泊

–从地下水资源看,地下水均属不可再生型

–从降雨分布看,中东阿拉伯地区年降雨量不足160mm,其中2/3在100mm以下

?非洲是地球上另一严重缺水的地区

–在世界上缺水的26个国家中有11个都位于非洲

–近30年来,非洲人口增长率(30%)超过粮食增长率(2%),粮食不足,其主要原因是由于水资源的匮乏引起粮食生产不能满足要求

1.1.2 中国水资源短缺状况

?中国水资源短缺特点

?中国水资源短缺表现

I 中国水资源短缺特点

?中国人均水资源量不大,之享誉世界人均水资源占有量的1/4,居世界第110位

?中国水资源严重地分布不均匀:东南多西北少,相差悬殊

?年内分布不均,甚至出现连续丰水年或连续枯水年的情形,水资源供需矛盾突出

II 中国水资源短缺表现

?农业缺水

–目前全国有效灌溉面积约为0.481*108hm2,约占全国耕地面积的

51.2%,近一半的耕地得不到灌溉,其中位于北方的无灌溉耕地

约占72%

?城市缺水

–城市居民生活用水、工业生产及商业活动用水

1.1.3 水资源短缺的原因

?水资源不足

?用水浪费

1.1.4 水资源短缺带来的后果

?因水资源短缺引发战争

?水资源不足引起耕地灌溉不充分或根本得不到灌溉,引起生产不足,农业发展受到威胁和制约

?水资源短缺引起工业生产不能顺利进行,导致阻滞城市经济发展1.2当代资源短缺

—土地资源

? 1.2.1 土地资源的属性

? 1.2.2 世界土地资源概况

? 1.2.3 中国的耕地资源

1.2.1 土地资源的属性

?土地作为资源,它有主要属性:

–面积

–质量

1.2.2 世界土地资源概况

?全球总面积为51000*104km2,大陆和岛屿占14940*104km2,占29.2%,其中包括南极大陆和其他大陆上高山冰川所覆盖的土地。因此,无冰雪覆盖的陆地面积仅为13300*104km2

?土地资源存在着质量的属性(如土地的地理分布、土层厚度、肥力高低、坡度大小等),因此适于人类居住、人类进行各项活动的土地资源短缺,耕地资源极其短缺

1.2.3 中国的耕地资源

?我国的耕地特点

?我国耕地面临的压力

I 我国的耕地特点

?人均耕地面积小

–耕地总面积大,但人均占有耕地面积较小,只有世界人均耕地面积的1/4

?分布不均匀

–综合气候、生物、土壤、地形和水文等因素,我国耕地大致分布在东南部湿润区、半湿润季风区、西北部半干旱区、干旱内陆区和西部的青藏高原。

–东南部湿润区和半湿润季风区集中了全国耕地的90%以上

?自然条件差

–我国耕地质量较差,高产稳产田占1/3,低产田也占1/3

II 我国耕地面临的压力

?中国依靠占7%的耕地养活了世界22%的人口

?中国单位面积耕地的人口压力巨大,目前已经是世界平均水平的2.2倍

1.3当代资源短缺—能源短缺

? 1.3.1 能源的分类

? 1.3.2 世界能源消耗

? 1.3.3 中国能源发展和面临的问题

? 1.3.4 能源利用对环境的影响

1.3.1 能源的分类

?一次能源(指从自然界直接取得,而不改变其基本形态的能源,也称初级能源)和二次能源(指经过加工,转换成另一种形态的能源)

?常规能源(当前被广泛利用的一次能源)和新能源(指目前尚未被广泛利用,而正在积极研究以便推广利用的一次能源)

?可再生能源(能够得到不断补充的一次能源)和不可再生能源(须经地质年代才能形成而短期内无法再生的一次能源,但它们又是人类目前主要利用的能源)

1.3.2 世界能源消耗(当前特点)

?能源主要来自一次不可再生能源

–一次能耗结构发生改变,由以石油为主的一次能源消耗转变为以煤为主的能源消耗,并且天然气的消耗比重明显上升

?能源消耗水平差异很大

–占世界1/4的工业化国家消耗世界能源的3/4。其中,占世界人口5%的美国,能源消耗却占世界的25%。发展中国家能源消耗普遍较低。占世界人口15%的印度却只消耗世界能源的1.5%;中国的人均能源消耗不到世界人均能耗的1/3

?世界能源消耗在继续增长

1.3.3 中国能源发展和面临的问题

?中国能源的发展

?中国的能源问题

I 中国能源的发展

?1996年中国一次能源总产量为13.26*108t标准煤,是世界第二大能源生产大国,其中:

–煤炭产量居世界第1 位,原油产量居世界第5 位;天然气产量居世界第20 位,水力发电和核电分别居世界第4 位和第18 位

II 中国的能源问题

?人均能源资源和人均消费不足

?能源资源分布不均

?能源构成以煤为主

?工业部门消耗能源占有很大的比重

?农村能源短缺,以生物质能为主

1.3.4 能源利用对环境的影响

?城市大气污染

?增加了大气中CO2的积累

?酸雨

?核废料问题

1.4当代资源短缺—矿产资源短缺

? 1.4.1 矿产资源及其特点

? 1.4.2 矿产资源的供需矛盾

? 1.4.3 中国的矿产资源

1.4.1 矿产资源及其特点

?矿产资源是地壳形成后,经过几千万年、几亿年甚至几十亿年的地质作用而生成,露于地表或埋藏于地下的具有利用价值的自然资源?与其他自然资源不同,矿产资源有以下基本特点:

矿产资源基本特点

?不可再生性和可耗竭性

?区域性分布不平衡

?动态性

–矿产资源是在一定科学技术水平下可利用的自然资源,矿产资源的储量和利用水平是随着科学技术、经济社会的发展而不断变化1.4.2 中国的矿产资源及特点

?中国矿产资源

–中国已发现168种矿产,其中已探明储量有153种,大致包括黑色金属矿产、有色金属矿产、稀有和稀土元素矿产、冶金辅助原料、化工原料非金属矿产、特种非金属矿产及建材

?中国矿产资源特点:

–资源总量大,但人均占有量少

–富矿少,贫矿多

–地区分布不平衡

–规模小,生产效率低

2 全球环境问题

? 2.1 气候变化

? 2.2 臭氧层破坏

? 2.3 生物多样性锐减

? 2.4 海洋污染

2.1 气候变化

? 2.1.1 人类活动对气候变化的影响

? 2.1.2 全球气候变化及其可能造成的影响

2.1.1 人类活动对气候变化的影响

?人类在自身发展过程中对能源的过度使用和自然资源的过度开发,造成大气中温室气体的浓度一极快的速度增长,使得温室效应不断强化,从而引起全球其互的改变

?温室气体(CO2,CH4,N2,氟里昂及替代物,六氟化硫,臭氧等)

2.1.2 全球气候变化及其可能造成的影响

?气候变化一般包括气温、降水和海平面的变化,研究表明:–过去100年里,全球平均气温上升了0.2~0.5° C,全球海平面上升了10~25cm,全球陆地降雨量增加了1%。

–如目前的温室气体排放不采取有效的控制对策,预计到2010年,全球气温将升高1~3°C,全球海平面将上升15~100cm,降雨强度将进一步增加

?气候变化造成的影响

–对人体健康的影响

–对水资源的影响

–对森林的影响

–对沿海地区的影响

–对生物物种的影响

–对农业生产的影响

2.2 臭氧层破坏

? 2.2.1 臭氧层

? 2.2.2 臭氧层破坏的原因

? 2.2.3 臭氧层破坏的后果

2.2.1 臭氧层

?平流层中最重要的化学组分就是臭氧,它保存了大气中90%的臭氧,人们将这一层高浓度的臭氧称为“臭氧层”。

?臭氧层的作用:

–臭氧对太阳的紫外辐射有很强的吸收作用,有效地阻挡了对地表生物有伤害作用的短波紫外线。因此,实际上可以说,直到臭氧层形成之后,生命才有可能在地球上生存、延续和发展,臭氧层是地表生物的“保护伞”

2.2.2 臭氧层破坏的原因

?科学研究证实:

–人工合成的一些含氯和含溴的物质中的氯和溴在平流层通过催化化学过程破坏臭氧是造成南极臭氧空洞的根本原因( 最典型的是氟氯碳化合物即氟里昂CFCs 和含溴化合物哈龙Halons)

2.2.3 臭氧层破坏的后果

?对人体健康的影响

?对陆生植物的影响

?对水生生态系统的影响

?对生物化学循环的影响

?对材料的影响

?对对流层大气组成及空气质量的影响

2.3 生物多样性锐减

? 2.3.1 生物多样性和生物资源

? 2.3.2 生物多样性锐减

2.3.1 生物多样性和生物资源

?生物多样性

?生物资源

I 生物多样性

?指地球上所有生物—动物、植物和微生物及其所构成的综合体?包括3个层次:1)生态系统多样性、2)物种多样性和3)遗传多样性。生物多样性的3个层次完整描述了生命系统中从宏观到微观不同认识方面

?生态系统多样性指生物群落和生境类型的多样性。生态系统的主要功能是物质交换和能量流动,维持系统内生物生存与演替的前提条件

?物种多样性指动物、植物和微生物物种的丰富性。物种是组成生物界的基本单位,是自然系统中处于相对稳定的基本组成成分?遗传多样性指存在于生物个体内、单个物种内以及物种之间的基因多样性。物种的遗传组成决定着它的性状特征、其性状特征的多样性是遗传多样性的外在表现

II 生物资源

?生物资源及其特性

?生物资源的价值

i 生物资源及其特性

?指对人类有直接、间接和潜在用途的生物多样性组分,包括生物的遗传资源、物种资源、生态系统的服务功能资源等

?特性

–生物资源属于可更新资源,在一定的环境条件下,具有一定的可更新速度,在时间、空间范围内和环境条件一定的情况下,可更新速率是有限的,因此,生物资源是有限的

–生物资源,是一种公共资源,具有很强的自然属性,不具有市场贸易属性和交换的经济价值,因此,长期以来,被人们认为是公共的、免费的资源

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Popular events like the football world cup and other international sporting occasions are essential in easing international tensions and releasing patriotic emotions in a safe way. To what extent do you agree or disagree with this opinion? The World Cup football match and the Olympics are held worldwide with great national support and expectations. As a fan of those competitions, I agree with the idea that sporting events can be necessary for international relations and national unity. In this essay, I will think about the effects of these popular sporting events. First of all, the World Cup, Olympics and other international games work for easing tensions among different nations. For example, South and North Korea have football games regularly which give two nations a chance to understand each other deeply. In the mid 1990s, a hundreds of North Korean supporters came to South Korea with the footballers and they were very excited during the sporting events. Even if it sounds ridiculous, many South Koreans were quite surprised at that moment when North Koreans shouted and cried during the match. We all realized that they were very normal sports fans even though they were occasionally very secretive. Through the sports, two divided nations could reduce their political and ideological tensions and could feel the patriotic unity. On the other hand, some sports matches can make international relations worse. For instance, football or baseball games between Korea and Japan are always big matches in two countries where full of tensions overflow. Sometimes, after the matches, the two rivals blame each other and their patriotic emotions explode in an aggressive way. Even much worse scenario is that the troubles caused by losing games affect the players directly. As far as I know, a couple of Korean players in Japan are suffered from invisible discrimination after the match between two countries. In conclusion, I think that international sporting occasions can be one of the good ways to ease tensions or to release patriotism safely. However, I believe that games can not be the fundamental ways for the sound patriotism or peaceful international relations Some people say that the Internet is making the world smaller by bringing people together. To what extent do you agree that the internet is making it easier for people to communicate with one another? In today?s world _ due to the advancement of technology new inventions are coming into existence. It is a certainty that ?necessity is a mother of invention?. _ Internet is just like a wonder box, which contains every type of information. Besides it has also proved as a very important tool to connect people with each other. In today?s modernized era nobody has sufficient time to write letters to their loved ones. Moreover it also takes longer to send or receive any information. But through an internet it is an easiest way to send massages to our loved ones. Either it can be in the form of an e- mail or by text messages from internet to cell phones. We can send and receive messages straight way. In other hand today?s youth generation mostly prefer to do chatting on () internet. Through this chatting we can write messages and straight way can get their reply. Moreover voice chatting is going to be very popular day-by-day.

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