急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到[email protected]

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急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到[email protected]急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到scxyfs@yahoo.

急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到[email protected]
急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到[email protected]

急求英语演讲ppt,吸引人的主题,最好是环保,四级水平不用太难.发到[email protected]
Protection of the Environment
Once man did not have to think about the protection of his environment.
There were few people on the earth,and natural resources seemed to be
unlimited.Today things are different.The world has become too crowded.
We are using up our natural resources,and polluting our environment with
dangerous chemicals.If we continue to do this,human life on earth will
not survive.We realize that if too many fish are taken from the sea,there
will soon be none left.Yet,with modern fishing methods,more and more
fish are caught.We know that if too many trees are cut down,forests will
disappear.Yet,we continue to use powerful machines to cut down more
and more trees.We see that if rivers are polluted with waste products,
we will die.Yet,waste products arestill put into rivers.We know that
if the population continues to rise at the present rate,in a few years,
there won’t be enough food.What can we do to solve these problems?If we
eat more vegetables and less meat,there will be more food available.Land
for crops feeds five times more people than land where animals are kept.Our
natural resources will last longer if we learn to recycie them.The world
population will not rise so quickly if people use modern methods of birth
control.Finally,if we educate people to think about the problems we shall
have a better and cleaner planet in the future

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