New energy source from tap water & other environmental news

I thought that this science story was pretty interesting. I will be watching it to see if it develops into something practical or just mysteriously vanishes like so many promising new power source stories.
Other environmental news stories : a total ban on cod fishing is being proposed. This is the most drastic step yet mentioned in the crisis over dwindling populations of cod due to overfishing.
Zoologists working to save African elephants from extinction have indicated that rising prosperity in China is fueling demand for ivory and endangering the elephants.