Times of India: Man-made factors, including climate change, could dry up a key source of water for millions of Americans living in southwestern United States. Researchers at Scripps Institution of Oceanography, University of California, San Diego, have predicted that there is a 50 per cent chance that Lake Mead, a key source of water for millions of people in the southwestern United States, will be dry by 2021 if climate changes as expected and future water usage is not curtailed. Aqueducts …