China's first offshore million-tonne carbon storage project was put into operation on June 1 in the South China Sea, according to the China National Offshore Oil Corporation (CNOOC). The project is designed to store a total of more than 1.5 million tonnes of carbon dioxide (CO2), which is equivalent to planting nearly 14 million trees, according to the company. The project, serving the Enping 15-1 oil platform 200 km southwest of Shenzhen, captures and processes CO2 from oilfields and then injects CO2 into a "dome" geological structure at a depth of around 800 meters under the seabed and about 3 km from the platform. The project's operation signifies China's achievement in acquiring a complete set of technologies and equipment for capturing, processing, injecting, storing and monitoring CO2 at sea.