A thick layer of toxic foam has covered Sao Paolo's longest river. Aquatic animals are dying and environmentalists are blaming nearby industries for the hazard.

Brazil: Tiete river becomes a dumping ground for industrial waste

In Russia, a group of environment campaigners is now using water drones to assess the damage caused. Watch report.

Underwater drones used to assess damage: Evidence of toxic poisoning in Russia's Kamchatka

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Brazil: Tiete river becomes a dumping ground for industrial waste

Underwater drones used to assess damage: Evidence of toxic poisoning in Russia's Kamchatka