Are you familiar with Fukushima? The genie is out of the bottle,....and yes, radionucleides are the heavy metals and toxicities we are now dealing with,....and will be for 2,400 years,...the half-life of Pu. (Not to mention the cesium-137, cobalt-60, strontium,....don't get me started.)
Fungus is our problem. They are now 'mutating' all over the globe!