LOADING...
Please be patient.
Emissions largely associated with the combustion of fossil fuels and agriculture has caused elevated atmospheric deposition of nitrogen (N) and sulfur (S) throughout much of the developed world. Increased...
This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by [publisher] and can be found at: http://www.pnas.org/.
Correction: We discovered two typos and a change in a sentence needed in our published manuscript.