Subject(s): Climatic changes -- Agriculture -- Crops and climate -- temperature -- Forestry -- Soil -- Climate change, effects of changes in world hydrological cycle on availability of water resources, effects of global change on social conditions in relation to plant growth and food production, Co2 fertilization effect- higher carbohydrate production and retention as biomass and seed yield, effects of elevated Co2 and temperature change on transpiration and crop water use,effects of higher day and night temperature on growth and yields of some crop plants, adverse effects of elevated levels of ultraviolet -B radiation and Ozone on crop growth and productivity, combined effects of changing Co2, temperature UV-B radiation and O3 on crop growth -- Potential effects of climate change on world food production and security, climate change, global agriculture and regional vulnerability, integrating land-use change and evaluating feedbacks in global change models IMAGE 2 approach, global change impacts on agriculture, forestry and soil- program of global change and terrestrial ecosystems core project of IGBP, global climatic change and agricultural production- assessment of current knowledge and critical gaps