Eh? The latter two are nominally true. They could happen whenever, but so far haven't. The former two will definitely happen we just don't know the time scale.

Eh? The latter two are nominally true. They could happen whenever, but so far haven't. The former two will definitely happen we just don't know the time scale. Yellowstone is on a timer that we don't have access to, and there are projects to drill down into it and deplete the heat, giving us electricity and solving the problem. With respect to the magnetic pole, this is something that is actually happening. Observe The magnetic pole in 2009: https://tools.wmflabs.org/geohack/geohack.php?pagename=North_Magnetic_Pole&params=84.9_N_131.0_W_&title=Magnetic+North+Pole+2009 https://tools.wmflabs.org/geohack/geohack.php?pagename=North... The current position of the magnetic pole: https://tools.wmflabs.org/geohack/geohack.php?pagename=North_Magnetic_Pole&params=86.5_N_172.6_W_&title=Magnetic+North+Pole+2017+est https://tools.wmflabs.org/geohack/geohack.php?pagename=North...