The image is from www.stopnuclear.net.
This has caused a storm on Twitter and Twitter-related platforms in Japan, with many accusing the illustrator of "fanning the nuclear fears unnecessarily and of discrimination" against people in Fukushima. If you read Japanese, here's the togetter collection of such tweets.
I think it upsets many because Wada's poster is too real. A nuke plant in the background spewing radioactive fallout, and a mother and a child. Other posters are either abstract, or do not have human figures in the poster in a life-like setting.
I personally think it is a brilliant work, like Professor Hayakawa's map.
You can view over 200 posters at www.stopnuclear.net.
Makoto Wada's other works can be viewed here.