Mighty rivers that inspired religions, civilisations and explorers are among the ten most threatened in the world. The world`s most important rivers are dying as a result of man-made problems, threatening humans and wildlife alike. The World Wildlife Fund document, World`s Top 10 Rivers at Risk, published ahead of the World Water Day on Thursday, lists the top 10 rivers around the world that are drying out or dying as a result of climate change, pollution and dams.