Mysterious Dark Stain Appears Off Rio Coast, Sparking Environmental Concerns

A large dark stain was discovered off the coast of Rio de Janeiro near Barra da Tijuca Beach. The pollution caused concern among researchers and residents. Biologist Mario Moscatelli stated, "This stain is associated with urban growth, which lacks universal sanitation." Drone footage shows sewage flowing from the city into the lagoon and then into the sea. The water's greenish hue suggests cyanobacteria, algae that thrive in polluted environments. This highlights the urgent need for improved sanitation in the region.