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By permission
Bhutan is one of the most heavily forested countries in the world, with close to 70% of the country covered by dense vegetation.
Unlike neighbouring Nepal, which has lost much of its forest cover, Bhutan has conserved its trees by insisting that any logging must be undertaken by permission.
Many towns and villages now draw power and heating from the country's vast hydro-electric schemes.
Exports of electricity to India are a key source of foreign exchange.