In an April 5 story about encroaching sands, The Associated Press erroneously described the annual distance shift of sand dues in Mauritania. According to government data, the dunes are said to be moving about two to 2 1/2 miles per year, not four to six miles per year. The incorrect figure came from a faulty metric conversion.
This was the entry last April 5 - "At that rate, he has to sell a goat a month to pay for keeping the desert at bay in a country where the dunes are said to be shifting at an estimated 4 to 6 miles per year, according to government data."
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