In 2011, the tiny mountain nation of Bhutan announced a lofty goal: make the country’s agricultural system 100 percent organic by the year 2020. If it succeeded, it would be the first country in the world to achieve the feat. Bhutan — nestled in the Himalayas between India and China — only has about 700,000 people living within its borders, and most are farmers. It’s a majority Buddhist kingdom, and its culture reflects several key…