Well, our body is well evolved to handle natural sources of radiation which, nonetheless, can absolutely harm us.
We can handle a surprising amout of damage from UV, which luckily does not penetrate our entire body. And we've evolved to handle certain other kinds of radiation damage, heck, there's that evidence of hormesis. I don't know how that applies across the wholebody, nor how persistently high levels over a lifetime might cause an issue.
I also don't know how to address all the sources you listed because, well, I don't know much about this, that's why I was asking here. I did look for solar flux at radio frequencies here: http://www.astro.ethz.ch/people/pdf_files/benz/LBReview_thermal.pdf and if I'm reading the units right, it is not even close to being on the same scale, but... not sure really.
And I certainly don't know the power of all those other various sources.
But, this was interesting.
So, seems to me from that chart and inverse square estimate, that a cellphone up close against you would have 500x the wattage of an FM radio station 10km away. Not that that dude's research was necessarily exculpating FM radio stations.
Glancing at the technical data here...
Seems like a baby monitor transmits about 100mW which is about 1/5th the power of the phone and of course not pressed against the flesh. Sooo.... if the cellphone is cranking out 500mW at say 1cm from some part of the body you might be concerned about, and the baby monitor is cranking out 100mW but 100cm away, then presumably the baby monitor is 1/50,000th the concern of the cell phone, right?