I believe cellular/wifi/RF radiation is more harmful than "commonly believed".
I believe cell phone radiation can cause brain cancer in children and heavy adult users -- especially the young (whose skulls are thinner).
I believe that Science's awareness of the danger of RF radiation mirrors Science's knowledge of the dangers of smoking in 1950, or narcotics in 1910. Google all the crazy stuff that happened in the 1950's (for example, ads promoting smoking by pregnant women) If you read your recent history, you can see just how drop-dead stupid science can be.
Long story short, science has been WRONG and proven QUITE FALLIBLE (not to say woefully ignorant) in the past; why should I treat Science as infallible now?
That having been said...
With (X) 5G satellites blasting 5G at the whole earth, how many satellites is that per square meter of surface? How could such satellites push much of a RF signal when they are limited by their power source? A satellite only has a few solar panels to generate electricity. I seriously doubt each satellite has a mini nuclear power plant on board...
It's a question of power or wattage. It doesn't matter what frequency or what the RF signal is used for. Looking only at the strength of the signal (which is what does the damage, right?), a satellite can only push out so many watts of RF signal per minute.
And the earth is a very, very big place.
Furthermore, I detect a high degree of fear-mongering, alarmism, and "over simplification" in the article. For example, they say "no place is safe" so everyone has to sign the petition, buy their products, buy their book, etc. You get the idea.
But I don't believe it. There's no way they're going to spend as much power broadcasting 5G signals to the wilderness of Alaska or the cattle grazing fields of West Texas as they spend broadcasting 5G to the major cities of America. Why would they do that? Black bears and longhorn cattle don't need 5G Internet, nor do they have cell phones.
Even if these 20,000 satellites were only to cover America -- America is also a very big place. Especially when the gun is shooting from low-earth orbit. Ever heard of progressing at a geometric rate? When something is expanding in 3D space, it dissipates very quickly. The decay is exponential as the covered area goes up exponentially from the source. Think of the area contained by a 1 meter cube, vs. a 3 meter cube, then a 10 meter cube, 100 meter cube, etc. The progression is exponential or logarithmic, not linear.