Behind a sand dune, in the shade of a tree, a woman is busy segregating litter. She has worn gloves and is putting a plastic potato chips wrapper into a big bag that is made from fibre. Thirty-three-year-old Fauzia Vilanculos is one of the waste collectors on the island of Benguerra in Mozambique. She has been segregating litter of plastic, glass, fabric, metal and paper. Marine litter tends to be plastic and fabric, often washed hundreds of kilometres from other continents.