This volume presents the work carried out by eight working groups at a meeting held in Bad Harzburg, Germany, in March 1993, to develop an assessment of the present and likely future carbon fluxes associated with the major components of the Earth's terrestrial biosphere. Major topics considered were: global carbon cycle; boreal forests and tundra; temperate forests; tropical forests; grasslands, savannas and deserts; land and water interface zones; agroecosystems; and biomass management.