The polluted state of America's waters, coastline and lakes.
What is the contaminant and how did the story line come about?
Reports of pollution in the North Sea remind Alistair Cooke of a childhood fishing trip.
Are profits polluting the UK water industry? Michael Robinson investigates.
Is plastic litter making the ocean a perilous place for fulmars and other seabirds?
Tom Heap investigates claims England's rivers are under threat from 'insidious' pollution.
Cleaning the seabed, one dive at a time. Miranda Krestovnikoff joins a new clean-up squad.
Paul Evans reports on the rebirth of the urban waterway.
What happens to the medicines we take after they leave our body? Andrea Sella finds out.