title: The evolution and future of Earth's nitrogen cycle.
authors.affiliation: Institute of Biology and Nordic Center for Earth Evolution, University of Southern Denmark, Campusvej 55, Odense M, Denmark. dec@biology.sdu.dk
authors.forename: Donald E
authors.initials: DE
authors.lastname: Canfield
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Glazer
authors.forename: Paul G
authors.initials: PG
authors.lastname: Falkowski