The kingdom of Bhutan, famous for maximizing "Gross National Happiness" rather than GDP, is sitting under a gigantic time bomb of water that could burst at any moment, flooding its villages and putting a major damper on all that good cheer. Bhutan has 2,674 glacial lakes, 24 of which are considered unstable. When the ice dams holding them back burst -- as happened in 1994, killing dozens -- they lead to "mountain tsunamis." Long-term, the bigger danger isn't too much water, but too little. Forty percent of the country's wealth comes from its hydroelectric dams, and its farmers rely on …
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