大一英语求该文段的主要从句和语法,急..

Question

明天要上台当英语老师讲课..
主要是讲该文段的从句和语法..急求~
我把分都给你们~
正文段：
It is people themselves who are biggest cause of destruction.The wealthy own the best land,and the poor of the world are forced to find land where they can find it--and it is there,under the trees.So the trees are removed.
When treesdisappear from the land,the water sources sunddenly disappear.The land itself washes away,either becoming very poor or complete desert.Worse still,the climate is likely to change as the trees are no longer there to absorb the carbom dixide in the atmosphere.The gas rises and traps the sun's heat in much the same way as the glass of a greenhouse,leading to a slow but steady build-up of temperature.
What is the way out,then?Both the problem and the solution seem to be econmic.Governments still need money to pay their debts,settlers still need money to feed their families,and companies still need to make profits.On the other hand,by purchasing renewable rainforest products,and demanding sustainable harvesting of rainforest resources,we all can be part of the solution and it is human begins that will be saved.

拜托了。。明天的课，麻烦大哥大姐们。。我给全分你们~

Answer 1

我按照每个句号为一句逐句分析。。。
第一段，第一句是强调句式，it is +who/that的强调句，在这句中，强调的是people这个主语，在这里themselves是people的同位语。第二句，是个并列结构，用and连接；其中值得提下be forced to do的用法，还有就是where they can find it及后面的那些补充，是land的定语，构成一个定语从句。So这句没有什么好讲的，一个简单的被动语态。
第二段，第一句，when 引导的时间状语从句。第二句，becoming 引导的是一个现在分词的独立结构，其主语是The land,这里面可以讲下either or的用法;第三句as引导了一个原因状语从句，里面值得讲的词组有be likely to do；第四句，the same way as 的用法可以提下，leading所引导的那句分句是现在分词的独立结构，主语是the gas。
第三段，第三句，并列句结构，没什么好讲的，第四句，by purchasing,后面的demanding是在by后用现在分词做状语，表示一种方式，主语是后面的We。最后 it is human beings that will be saved.还是简单的强调句，是由Human beings will be saved.改变过来的。。。
累了，不知道可以不？
一会看丁俊晖比赛，呵呵，顺便帮你看看～～

Answer 2

It is people themselves who are biggest cause of destruction.(it is ...that这种结构是强调句型,在这里强调的是主语people themselves)The wealthy own the best land,and the poor of the world are forced to find land(前面的是并列句,后面的是定语从句修饰前一个名词land,且先行词在从句中作状语) where they can find it--and it is there,under the trees.So the trees are removed.
When treesdisappear from the land,(前面的是时间状语从句)the water sources sunddenly disappear.The land itself washes away,either becoming very poor or complete desert.Worse still,(前面的插入语)the climate is likely to(前面的be likely to do sth结构是"有可能...") change as the trees are no longer there to absorb the carbom dixide in the atmosphere.(前面的as引导的是原因状语从句)The gas rises and traps the sun's heat in much the same way as the glass of a greenhouse,leading to(现在分词作结果状语) a slow but steady build-up of temperature.
What is the way out,then?Both the problem and the solution seem to be econmic.Governments still need money to pay their debts,settlers still need money to feed their families,and companies still need to make profits(以上是一个并列句).On the other hand,by purchasing renewable rainforest products,and demanding sustainable harvesting of rainforest resources,we all can be part of the solution and it is human begins that will be saved.(这又一个强调句型,其中begins应该是beings,前面的and连接两个句子构成的并列句)

Answer 3

真好，能给100分呢，可惜句子里面内容太多，打着太费劲了