A view of the Dzong, a fortress, is seen in Punakha, Bhutan, in this April 19, 2007 file photo. The isolated mountain kingdom of Bhutan has done more to protect its environment than almost any other country. Yet Bhutan could pay a high price for the sins of others -- global warming is a major threat to its fragile ecosystem and the livelihoods of its people.To match feature BHUTAN-CLIMATE
REUTERS/DESMOND BOYLAN