I did look into the theories years back but was left undecided and more than a little bewildered by it all.

The most interesting one I thought was that it is indeed true and all governments have done so since the mid-1990s. Not as a covert population control measure to poison enough of them to keep typical life expectancy from going too high, but for a beneficent purpose... to help shield the world's population from the effects of a weakening magnetosphere and the increase in radiation.

Those that promote it say in late March or early April 2023, with March 23 the most forecasted date, the earth will suffer a catastrophic magnetic pole reversal. These reversals, they maintain, occur on average every 12,700 years.

It's said if and when it happens it will be so violent most people will die instantly as virtually every structure on the surface will collapse and for those outdoors who are standing will suffer broken legs at a minimum. Survivors would then have to contend with monster-sized tsunamis. All those not high enough above sea level will drown.

Further, the connected billionaires who are aware of what's inevitable believe they can survive it inside their underground cities that they have been constructing for decades. The largest of which is directly beneath Denver airport in Colorado, USA.