New NASA data show how the world is running out of water - The Washington Post. StartFragmentThe world’s largest underground aquifers – a source of fresh water for hundreds of millions of people — are being depleted at alarming rates, according to new NASA satellite data that provides the most detailed picture yet of vital water reserves hidden under the Earth’s surface. Twenty-one of the world’s 37 largest aquifers — in locations from India and China to the United States an