Australia has recycled 150,000 wheelbarrows of shells, and fish are coming back fast

Australia’s shell‑based reef restoration program in Port Phillip Bay is reconstructing reefs by placing rock and recycled shells on the seafloor, forming the base for new habitats. UNEP reports that 62 hectares across 21 sites have already been rebuilt, supporting marine life recovery and nearby communities. The effort aims to restore 300 hectares across 60 locations by 2030, potentially making Australia the first country to recover a critically endangered marine ecosystem. Restored reefs are already increasing fish stocks by about 50 tonnes annually and hosting around 250 species, up from 175 in nearby areas. The reefs filter up to 125 billion liters of seawater yearly and remove up to 14 tonnes of nutrient pollution, delivering broad ecological and economic benefits, including job creation and ecotourism growth, estimated at nearly A$14 million in ongoing annual benefits.