Climate change will affect on vegetation directly because of increased CO2 concentration and green house gases and indirectly through stratospheric ozone layer depletion. Increased CO2 level could increase photosynthesis and water use efficiency. However high temperature and green house gases will modify rainfall, evaporation, runoff and soil moisture storage and will adversely affect growth and productivity. The increased amount of ultraviolet (UV) radiation due to depletion of stratospheric ozone layer will exert its deleterious effect on growth and productivity by destruction of chlorophyll and reducing photosynthetic rate.