Here is from The Japan Times:

“Four antinuclear groups demanded Monday that the government withdraw its decision to set the annual radiation limit at 20 millisieverts for schoolchildren in Fukushima Prefecture, saying the standard poses a health risk.

“The four groups — Friends of the Earth Japan, Green Action, Fukuro no Kai, and Mihama no Kai — said during meetings with government officials in Tokyo that 20 millisieverts is the upper ceiling of a safety standard set in 2007 by the International Commission on Radiological Protection.

“The groups said a safer standard should be adopted for schoolchildren.”

Hey, this solves everything! When the evils in the environment surpass the designated threshold of safety, we can just move the threshold. Maybe we can convince McKibben to change his 350.org to 400.org and relax!