The results of the Integrated Sink Enhancement Assessment (INSEA) project of the 6th Framework Programme on �Data and Database Strategy� (Working Package 3000) are presented. The articles of the book include a wide range of studies carried out in the EU: observation of available data sources on soils; the organic carbon content in the top soil and its validation; field verification of the changes in the soil organic carbon; application of the field-scale model EPIC (Environmental Policy Integrated Climate) to project the changes in soil organic carbon content due to land management. The book addresses specialists and those who are focused on the research of the soil organic carbon.JRC.H.7 - Land management and natural hazard