Jessica Droujko loves rivers. In order to better protect them, she founded the start-up Riverkin, which uses a special sensor to measure the health of bodies of water.
Humans have put a lot of obstacles in the way of fish wishing to migrate and spawn. A new 'Fitbit for Fish' will test just how stressful their journeys are.
A student-led initiative in Zurich called Autonomous River Cleaning (ARC) wants to tackle plastic pollution in rivers with a robotic vessel that can gather, sort and analyse waste.
