"The isotope records really closely follow the atmospheric acidity trends," says Becky Alexander. "You can really see the effect of the Clean Air Act in 1970, which had the most dramatic impact on emission of acid from coal-fired power plants." (Credit: Joe Lodge/Flickr)
Top StoryUniversity of Washington

Ice cores show Clean Air Act eased acid rain

"Temperature and moisture are hugely important to salamanders," says Dean Adams. "They have a lot of exchange with the environment on a daily basis. One way they deal with warm and dry conditions is to become less active. They forage less, and, ultimately, they grow less." (Credit: Brian Gratwicke/Flickr)
Top StoryIowa State University

Salamanders shrink as Appalachia heats up

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