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>> reporter: an entire city thinking about the same thing, though collectively starting to connect the dots. >> translator: a bit later, we realized it was the north koreans. >> translator: i'm worried about the radiation. it could really hurt us. >> reporter: concerns over raid escaping from the test site have increased with each explosion. so were concerned it could collapse. china said it has not detected anything of the sort and that its military keeps a vigilant watch over air levels. >> translator: i have a

We are back with a very special edition of "sgmd" from japan. we have been traveling all over the country looking at the survivors of the tsunami. there's been lots of concerns about radiation. we have been talking about this but we know there are a lot of questions about it as well. we are in tokyo now. this one comes from a cnn.com reader. is it far too early to comment on the long-term or short-term damage of radiation that's a result of the fukushima diz astzer? it's a great question. a question on a lot of people's minds. the short answer is yes. at this point and time, it is too early to...

>> reporter: the concern is way up but i can tell you that radiation is heavier than air so the wind when you're talking about radiation plays a key part in it. the wind direction and speed. i don't want to get bogged down in a lot of science. here is the simple terms of how radiation affects are felt. an x-ray has four milis evers. the air levels at fukushima 400. radiation poisoning starts at a thousand, that's when i get nausea, diarrhea and fatigue. if you get to 3,000, or 5,000 in a dose megyn the you will die ty say within 30 days. if you're getting 400 at a constant level which many of ...

It's accurate. coal and oil put out lots of carbon dioxide emissions. on the right would be the equivalent number of emissions, value of emissions put out by geothermal. they release -- actually, not an equivalent. they reless less than 1% of the carbon emissions of a fossil fuelled plant. geothermal plants emit 97% less of the acid rain causing sulfur compounds emitted by fossil fuels. one of the ideas you'll think about. you'll hear more in the coming months so worth knowing what it is. obviously, if you want more information, lots available on the internet. let's take a look at some of the ...

But only after the air levels, the toxic levels have reduced enough so that it's safe. what they found when they went in this morning was it was of too high. it was an explosive mixture of methane, carbon monoxide and hydrogen. they pulled back out again. they hope to resume in a matter of a few hours. as the governor said at a news conference just a while ago, for these families nothing really has changed. hope remains alive, and here's what he said about that. >> they understand that if we have any hope of survival and they're in a rescue chamber, they're still okay. that's, i mean, that's t...