Within hours of collection, and with the assistance of local scientists and universities, they preserved the samples to extract and isolate the fungal DNA. The researchers then used modern genomic tools to sequence unique stretches of the environmental DNA that can be used as barcodes to identify all of the fungal species present in each sample. (Credit: knitting iris/Flickr)
Top StoryStanford University

DNA ‘barcodes’ reveal North America’s 10,000 fungi

"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

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