Summary: © 2008 Macmillan Publishers Limited. All rights reserved.© 2008 Macmillan Publishers Limited. All rights reserved.
nature geoscience | VOL 1 | JULY 2008 | www.nature.com/naturegeoscience 409
VINEY P. ANEJA1
*, WILLIAM H. SCHLESINGER2
AND JAN WILLEM ERISMAN3
are at the 1
Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina 27695-8208, USA; 2
Cary Institute of
Ecosystem Studies, Millbrook, New York 12545, USA; 3
Energy Research Centre of the Netherlands; PO Box 1, 1755 ZG Petten, The Netherlands.
he demand for food, feed, fibre
from the Earth's growing
human population is expanding.
Increasing consumption of
animal protein, as opposed to