To Stop Dust Bowl, Mongolia Builds 'Great Wall' of Trees - WSJ.com: "More than 2,000 years ago, China began to build the Great Wall. Today, Mongolia is building its own seemingly implausible version: a zigzagging line of pines, willows, oleasters, junipers, hawthorns, aspens and other trees it hopes will someday stretch more than 2,000 miles across the desert. The so-called "Green Wall" is expected to take 30 years to complete and cost some $150 million or more."
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