This book reports on the results of experiments to assess the effects of global climate change on the agricultural production of crops and livestock. It covers issues such as the CO. fertilization effect, the adverse effects of elevated levels of UV-B radiation and ozone on plant growth and productivity and on livestock. Combined effects are also studied including changign CO, temperature, and UV-B radiation and O simultaneously on crop growth. The chapter given an idea of teh overall global picture in terms of the effects already discussed. Changes in the world hydrological cycle, the regional availability of water resources, changes in soil conditions and the impact of this on food production, as well as modelling techniques, are all examined."A reassessment of the effects on agricultural production will therefore be necessary in a few years ' time. This is also in view of the ever-increasing amount of free-air measurements and experiemental data on the effects of increasing atmospheric CO, concentrations on plant growth and soil conditions.