4K river foam settling in the bedside of the Ria de Aveiro on the estuary of river Vouga, 60fps

ecosystem substance ecological poisoned disaster damage aquatic treatment floating cyanobacteria discharge stagnant flowing messy outdoor unhygienic effluent chemical bubbles problems danger white stream tainted toxic environmental surface dirt abstract contamination environment industrial liquid outdoors closeup background contaminated lake sewage foam pollution ecology dirty nature water polluted river 4k 60fps