(b)Impact on fresh water resources 1. Change in precipitation • Increase flooding • Increase in northern high latitude during the winter, and south-east Asia in summer. • Other region , southern Europe, Central America expect significantly drier summers. • Precipitation and river flows are expected to increase at high latitude and some parts of tropics. • Precipitation is expected to decrease in mid- latitude and dry tropical regions. • Less water availability at the surface due to increase in evaporation .
b)Impact on fresh water resources 3. Reduction in soil moisture for crop growth. • Change in seasonal distribution of river flown water supply for agriculture and hydroelectric power generation. • Changes in runoff Example in higher temperature in mountains of California and Origen during the winter will increase the winter run-off , therefore the summer runoff will be reduced. • More intense hydrological cycle. tropical storms , such as hurricane, cyclone and typhoon are expected to grow more intense
Impact on agriculture and food supply • Reduction in the agricultural productivity due to degradation of soil and loss of fresh water. • Difficulties in matching crops and trees to new climate. • The changed temperature and rain fall resulting in stunned growth or a greater susceptibility to disease and pests. • Declining food availability. • Loss of employment
Impact on agriculture and food supply 6. For cereal crops in mid-latitudes to High latitudes, potential yields are projected to increase for small increase in temperature, but decrease for larger temperature rises. 7. For most tropical subtropical regions (Low latitude)potential yields are projected to decrease for most increases in temperature; this because such crops are near their maximum temperature tolerance.