Here are wonderful websites to help you generate global context for the current status of the pedosphere:
http://www.cals.uidaho.edu/soilorders/
http://eu.montana.edu/climb/docs/CLIMB-7SoilProfiles.pdf
http://www.fao.org/3/a-i6478e.pdf
http://www.fao.org/soils-portal/en/
https://www.nrcs.usda.gov/wps/portal/nrcs/site/soils/home/