Japan says it will release more than one million tonnes of contaminated water from the ruined Fukushima nuclear power station back into the sea, in a decision that drew swift condemnation from South Korea and environmental groups and is likely to anger the fishing industry. Al Jazeera reports that the water, equivalent to about 500 Olympic-sized swimming pools, has been treated but needs to be filtered again to remove harmful isotopes. It will also be diluted to meet international standards before any release into the ocean in a process that will begin in about two years and is expected to take decades. The water, used to cool the reactors after the meltdown in March 2011, is currently stored in tanks in and around the plant, on Japan’s northeast coast.