See, they say the Earth's magnetic field is gradually getting weaker, and they're not entirely sure why. So of course they're doing lots of research into all sorts of theories as to why.
Weakening of the geomagnetic field is due the pole reversal that happens periodically over time. It's bad news, but not catastrophic.
Well have they considered that over the past century, humans have wrapped lots of the planet with degaussing coils? We call them power lines...
I seriously doubt that the whole of humanity's electric infrastructure is powerful enough to interfere with the colossal magnetohydrodynamic dynamo at the core of the planet.