Reuters: Deforestation slowed in the last decade, in the first sign that global conservation efforts are bearing fruit, but an area the size of Costa Rica is still being destroyed each year, the United Nations said on Thursday. A report by the U.N. Food and Agriculture Organization (FAO) found that about 13 million hectares of forest a year were converted to other uses or lost through natural causes in 2000- 2010, down from 16 million a year in the previous decade. The net loss of …