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Posted Tue Oct 7 2008: from Columbian.com:
Lichens may be canaries in the coal mine http://apocadocs.com/s.pl?1223388961
 Samples were sent to a University of Minnesota laboratory for analysis of their nitrogen and sulfur content. The results set off alarms. "Lichens indicating nitrogen-enriched environments were abundant," Geiser wrote in a 2007 article published in the journal Environmental Pollution. "The atmospheric deposition levels detected likely threaten gorge ecosystems and cultural resources" such as Native American petroglyphs and pictographs rock art, she wrote.
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