From October 10 to 12, 2017 the iDiV workshop "The European Mass Balance of Wood" will take place at the MPI for Biogeochemistry, organized by Prof. Detlef Schulze. Experts from 14 different European nations will try to resolve the apparent negative mass balance of timber in Europe. The forest scientists will discuss uncertainties of harvest, wood use, bioenergy, imports, and exports. On Tuesday October 10 there will be presentations by each nation, on Wednesday the situation in different regions of Europe will be discussed aiming at a final synthesis.