> the genetically-modified glowcats mentioned in the article is the closest thing I can imagine that could work Except that the proponents seem to have forgott

> the genetically-modified glowcats mentioned in the article is the closest thing I can imagine that could work Except that the proponents seem to have forgotten the small fact of evolution. Species evolve. All the time. Over the course of a 100 century timescale I would expect the glowcats to evolve into quite different species, possibly several such species, or perhaps going extinct. It's anybody's guess, really, and whether they would retain the colour-change genetics is at best nothing more than a rather long-shot hope. Or those genes might evolve to cause the organism respond to other stimuli than radiation. The only certainty, here, is that such creatures will evolve into something different from what they start out as, so, almost certainly, defeating the original objective.