Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports.
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)