Up to 50% of natural intertidal coastal habitat around the world has been replaced by artificial seawalls. As a result biodiversity in these zones has declined significantly. But scientists at the Centre for Research on the Ecological Impacts of Coastal Cities at the University of Sydney have come up with a very simple solution. Placing flower pots on the artificial structures has encouraged new species of algae, crustaceans and sponges  to the area and increased biodiversity by between three to five times. This research has shown that by adding small cavities into seawalls, biodiversity can still flourish. This is heartening news in the face of increased urbanisation of coastal areas. Click here to read the full story.