... most severe problem with this letter is that the arguer fails to establish a causal relationship between the decrease of the amphibians' number and the global pollution of water and air. The pollution of the water and air may lead to the declination of the number's of animals living on the earth, for worse living condition----more poisonous materials dissolved in the water harmful to the digestive system of wild animals fed on natural water supply, polluted air bad for their respiration system-----set more difficulties for wild animal to live as comfortable as hundreds of centuries ago. But it does not make it reasonable in the reversed way that a certain kind of animals' declination in its number, amphibians as mentioned in the letter, should be blamed on the global pollution of air and water. Considering the relative good living condition in a national park, it is quite possible that the ...

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