The underwater world fascinates me. What life lies beneath the surface of a river or ocean? And what invisible changes are people causing in those systems?
A new study predicts drier summers and wetter winters will cause more agricultural fertiliser to be washed into the UK's rivers. Fertiliser pollution upsets the biological balance of a river and can encourage the growth of toxic algae.
Growing food is essential, but I worry that climate change will make farming even more damaging to our rivers.