By Bloomberg News November 24, 2013 Phung Thi Huu is embracing the global movement toward sustainable coffee two decades after she first planted the crop and brought her family out of poverty. “Coffee changed my life,” said Huu, a diminutive 53-year-old farmer with calloused hands and weathered skin in the coffee-rich Dak Lak province. “The future is brighter.” The adoption of certified coffee in Vietnam comes as bean prices slumped 35 percent from a March high to 29,600 dong ($1.40) a kilogram on Nov. 7, the lowest since October 2010 and threatening farmers’ income, data from the Dak Lak Trade & Tourism Center show. The price was 32,400 dong on Nov. 22. Photographer: Jerome Ming/Bloomberg She’s among thousands of Vietnamese farmers who benefited from coffee, which enabled her to expand her modest farm, buy family members motorbikes and provide her grandchildren with opportunities. Vietnam, the world’s biggest producer of...