Everything you need to know about the plan to release treated Fukushima water

Japan has announced it will dump 1m tonnes of contaminated water into the ocean, sparking controversy

• Fukushima: Japan announces it will dump contaminated water into sea

Japan's decision to release more than 1m tonnes of treated radioactive water from the stricken Fukushima nuclear plant into the sea has sparked controversy inside and outside the country. Here are some questions and answers about the plan, which is expected to take decades to complete.