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→‎Pollution: kenneth watt nitrogen
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*In 1970, biochemist [[George Wald]] claimed that pollution, among other things, would bring the demise of civilization by the year 2000.<ref>https://www.newspapers.com/clip/46817327/wald-forecast-end-of-mankind-within-15/</ref>
 
*In 1970, biochemist [[George Wald]] claimed that pollution, among other things, would bring the demise of civilization by the year 2000.<ref>https://www.newspapers.com/clip/46817327/wald-forecast-end-of-mankind-within-15/</ref>
 
*In 1970, the New York Times said that man must conserve resources to "save the [human] race from intolerable deterioration and possible extinction".<ref>https://www.newspapers.com/clip/110984014/if-the-fad-dies/</ref>
 
*In 1970, the New York Times said that man must conserve resources to "save the [human] race from intolerable deterioration and possible extinction".<ref>https://www.newspapers.com/clip/110984014/if-the-fad-dies/</ref>
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*In 1970, Kenneth Watt stated that it would only be a "matter of time" before nitrogen buildup would block all light and all agricultural land would become unusable.<ref>https://www.newspapers.com/clip/111881569/kenneth-watt-nitrogen/</ref>
 
*In 1980, [[acid rain]] is called a "front page concern" over the possible mass extinction events involving aquatic life.<ref>https://www.newspapers.com/clip/110819943/acid-rain/</ref>
 
*In 1980, [[acid rain]] is called a "front page concern" over the possible mass extinction events involving aquatic life.<ref>https://www.newspapers.com/clip/110819943/acid-rain/</ref>
  
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