Humans are depleting underground aquifers around the world at alarming rates, threatening hundreds of millions of people who rely on them for survival, according to a comprehensive study conducted by researchers from NASA and the University of California, Irvine. Twenty-one of the world's 37 largest aquifers are losing water at a greater rate than they're being refilled, falling victim to population growth and climate change. Thirteen of those diminishing water sources are experiencing "significant distress," including the Arabian Aquifer System, which supplies Saudi Arabia, Syria, Iraq, and Yemen, the Murzuk-Djado Basin in northern Africa, the Indus Basin of India and Pakistan, and the Central Valley Aquifer System in California.

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