The year of 2017 was named the International Year of Sustainable Tourism for Development by the UN. Sustainable holidays are growing in popularity among all eco-tourists. A Dutch association called Green Destinations has established a list of the Top 100 sustainable destinations. Some of them however are located in countries that are among the biggest polluters, yet are known for extensive efforts to protect the environment. Tourism-review.com brings the top 10 such destinations in alphabetical order.