Indo-Asian News Service: Shrinking Himalayan glaciers will turn the Ganga in India and the Yangtze in China into seasonal rivers that dry up in summers, massively reducing grain harvests, and may cause "politically unmanageable food shortages" in the region, a leading US environmental expert has warned. Climate-driven shrinkage of river-based irrigation water supplies in China and India, which produce half of the world’s wheat and rice, could be "civilisation-threatening". The scary scenario can become a reality …