Im interested to here what you have to say on my theory.


Well, you don't seem to have a theory at all. You have a couple of statements which you support with evidence: that world GDP and population have both increased dramatically in the last couple of centuries. OK, that's fine. You have a third statement: that it is inevitable that the Earth will go through a geomagnetic reversal. But you don't connect that third statement to the other two at all.

What you need in order to have a _theory_ is some mechanism, some chain of reasoning, some connection between the observed facts of population and GDP growth and your prediction of a geomagnetic reversal. What exactly is it about world GDP that correlates to the strength and direction of the Earth's magnetic field? How are the two linked? How does this _work_? That's what a theory should explain.