Pure conjecture. The magnetic poles have always moved and on occasions flipped north to south.

The magnetic North Pole location is dependent upon the movement of the liquid nickel-iron Outer Core. Magnetic fields originate and emanate from the liquid Outer Core. The magnetic field leaves the Earth at what we designate as the North Pole. The magnetic field lines surrounds the Earth in a protective shell and re-enter the Earth at the magnetic South Pole. Just like a bar magnet, a postive end and a negative end, or North-South.

Now the liquid Outer Cores swirls in currents and sloshes as the Earth wobbles (precession) on its orbit. The sloshing and the wobble causes the the magnetic pole to migrate. We have ample proof of this locked away in the lava beds that run parallel to the mid-ocen trenches (well mapped).

Lastly, the magnetic pole is different than the geographic pole. The Earth has a constant tilt, half the year towards the sun, half the year away from the sun. The tilt is about 23 degrees if I remember correctly. It doesn't change with the same frequency as the magnetic poles.

I'd be interested in a study regarding the effect of all of the fossil fuel we are pulling out of the ground and burning . . . . it must effecting the mass of the earth . . . . the gases have to go somewhere, so my guess is outer space . . . . that is why I would think the earth is losing mass as a result.

Well, the poles do shift....

A few centimeters a year isn't much so I'm inclined to accept it. China's big dams have moved enough water to a higher elevation to slow the speed of earth's rotation.