Guardian: The long, dark shadow cast by the meltdown at Japan's Fukushima Daiichi nuclear power station grew longer and darker on Wednesday as the plant's operator, Tokyo Electric Power Company, Tepco, admitted that 3,000 tonnes of highly toxic water had leaked from purpose-built storage tanks. The disaster, caused when the tsunami that followed the devastating earthquake in 2011 knocked out backup generators pumping water to cool the fuel rods, has cost more than $200bn (128bn) and is now expected to cost...