Dhaka, Sept. 13 -- Properly managing plastic and polythene waste is one of the biggest challenges facing the 21st century. They have become ubiquitous and can be found at the deepest point of the ocean to the highest peak to the remotest island.

The world has not made much progress when it comes to managing plastic waste. What is worrying is that a very small amount of plastic is ever recycled.

It is especially challenging in one of the world's largest refugee camps in Bangladesh's coastal district of Cox's Bazar where more than 1.1 million Rohingyas are staying. Unplanned makeshift houses mushroomed after trees were felled and hills razed.

It is unclear how much waste is produced at the camps daily, but a 2018 survey at Teknaf's Leda ...