[u320]

Tritium has a biological half-life in humans of 8 days. It's not a "big danger". Japan has gone out of their way to take all the precautions here, but since it's nuclear you know somebody is going to raise a stink anyway.

[pvaldes]

We share the planet with other organisms, and we even eat some of them.

"Is not a danger" here means "we don't know and, as long as liability is impossible to be traced back to us, we don't care".