nuclear plants around the world. the u.s. nuclclear regulatory commission says it is far less than what one might assume. says across country round trip flight exposes a person to 12 times more raise yadiation cd to the water from a nuclear plant. how will you know that this is the right decision? >> i think that we have the benefit of science. either you have certain radio new close i'd or you don't have it. and for that, you have -- it is measurable thing.i'd or you don it. and for that, you have -- it is measurable thing. so we have the science, the laboratory, we have a network of international laboratories working with us to ensure the credibility and transparency of the process. >> reporter: the release is drawing criticism from asia including south korea and china. despite reservations including those of local fishermen, it is moving forward, a process likely to take decades to complete. mark stewart, cnn, tokyo. >>> more than 25 million people across the milgz of ddle of the are at threat of a severe storms. and level two out of five is in effect for eastern colorado, northeastern new mexico, tex