There could also be a fluctuation, which could affect climate?
As Earth orbits the sun at supersonic speed, it cuts a path through the solar wind. This fast stream of charged particles, or plasma, launched from the sun's outer layers would bombard Earth's atmosphere if not for the protection of Earth's magnetic field.
Either a weak magnetic field exposing us to extensive cosmic radiation, or worse, a pole shift would be a disaster. It is believed that Mars became barren after it lost its magnetic field.
Immanuel Velikovsky became famous writing about the global cataclysm caused by a pole shift.
His science is questionable, but it makes for interesting reading on what it could mean for the future of earth.
@NotConvinced Sure, the Earth is fine. Just not the people who have to live (or die) when it happens.