Here in Japan, there isn't much that can't be enhanced by the addition of a cartoon character, preferably fluffy.
We found this "Hello Kitty Doomsday Clock" poster at the recent Asahi Blue Planet winners' lecture. It was being given out freely, and anyone who wants can apply for one here (but probably only for local residents).
It's worth clicking to look at the full size to read the text. Fortunately, it seems like the environment isn't very dangerous these days. This poster now has pride of place in our office.
But perhaps one step better, is the Fukushima Radiation Bird.
Kibitan (as he is known) is warning children not to play near: drains, gutters, puddles, trees, or grass, because of the naughty radiation that will poison you if you get too much of it in your body. So that leaves....um...well, not very much of Fukushima for all the little children to play in. Not that there is any need to evacuate, or anything like that. Just don't touch the trees, grass, puddles, gutters, or drains, and don't forget to wash and gargle every time you come in from outdoors, and you'll be just fine. Probably. Now isn't that reassuring?