Donna Danna (15 Jan 2011)
"Earth's Magnetic Pole Shift Causes Tampa Airport To Change Numeric Designators on Runway"

I just read in this article below that the Earth's magnetic pole shift caused the airport in Tampa, Florida to change its numeric designators on its runway because the numbers previously painted on the runway 
no longer match up with the magnetic measurements of sensitive airplane instruments so the Earth's magnetic poles must have actually shifted or they wouldn't be doing this.