Miami Herald: For the first half of his life, Gregorio Huanuco farmed to a rhythm that dictated the survival of his grandparents and ancestors for thousands of years. He waited for the rains to fall on his small parcel of land in this village at 11,000 feet in the Cordillera Blanca, or White Range, of the Andes in central Peru, and planted native varieties of potatoes as well as cereal crops like quinoa. When the crops ripened, Huanuco, 45, harvested what he needed and sold what he didn’t in the city of …