Good news is sometimes hard to come by, so this week we have assembled a few recent positive stories from H2O Radio that you might have missed.

Coral reefs that have been degraded by human activity and climate change can be restored fast—in just four years.

How swimming pools could be heated with your data.

If extraterrestrials do try to make contact, whales could help us speak their language.

Flower power! Scientists find a novel way to clean rivers.