This graphic may be reproduced in any form of educational or non-profit purposes without special permission from the GRID-Arendal, provided acknowledgement of the source is made. GRID-Arendal would appreciate receiving a copy of any publication that features this graphic.
No use of this graphic may be made for resale or any other commercial purpose whatsoever without prior permission in writing from GRID-Arendal. Applications for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to firstname.lastname@example.org.
For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
Nelson, A. 2008. Estimated travel time to the nearest city of 5,000 or more people in year 2000. Personal communication of December 8, 2008. Rammankutty, N et al. 2008. Farming the planet: 1. Geographic distribution of global agricultural lands in the year 2000', Global Biogeochemical Cycles, Vol. 22, GB1003, doi:10.1029/2007GB002952. HYPERLINK 'http://www.geog.mcgill.ca/~nramankutty/Datasets/Datasets.html' http://www.geog.mcgill.ca/~nramankutty/Datasets/Datasets.html (Accessed December 4, 2008)