在世界环保日来临前夕，联合国教科文组织就如何保护自然资源问题向全世界中学生征文。请根据提示以“Preserving Natural Resource”(保护自然资源)为题，写一篇英语短文。 要点： 1．随着人口的增长和科技的发展，自然资源月益短缺； 2．自然资源不可再生，许多资源濒临毁灭； 3．水资源越来越缺乏； 4．假如人类继续浪费资源。，不采取有效措施，子孙生存将受到威胁。
Preserving Natural Resources
Thrdugh the changes"in the ways Of making a living in a family over several gen，erations， man has been warned against waste of natural resources and emphasizing the urgent need to preserve these resources。
Ever since man appeared on the earth， man"s survival has been heavily relied on nature。 Almost everything we use in our everyday life comes fromm"notate， ranging from the food we eat， the water we drink， to the wood which is tm"ned into furniture。With the development of technology and population growth， the amount and range of materials used has increased at an alarming rate。However， natural resources are not inexhaustible。
Some reserves are already on the brink of exhaustion and there is no hope of replacing them。
The widespread water shortage is an example in point。 If man continued to squander natural resources with no thought for the future， the later generations would be in danger。 It is up to us to take effective measures before the situation gets out of hand。