Reuters has reported that Greenpeace has collected samples of seaweed -- a staple of the Japanese diet -- off of the coastline near the catastrophically leaking Fukushima Daiichi nuclear power plant that contain five times the "permissible" level of hazardous radioactive iodine-131. "Radioactive contamination is accumulating in the marine ecosystem that provides Japan with a quarter of its seafood, yet the authorities are still doing very little to protect public health," saidd Ike Teuling, a Greenpeace radiation expert. Meanwhile, Tokyo city officials have announced the radioactive contamination levels in sewage, which they are incinerating and then containing if above a certain level.