Bhutan will now impose a “sustainable development fee” (SDF) on Indian, Bangladeshi and Maldivian tourists, making visits to the Himalayan nation more expensive. The decision has been taken to protect the ecology and environment of the country, amid a spike in visitors from India.So far, tourists from the three countries had been exempt from a levy that other foreign nationals had to pay — $250 per person per day during the peak season, and $200 per person per...