Message #31969

[andre]

Unless there is some other source of energy in the earth's core that is not accounted for, the temperature MUST be lower than in the past.

yes there is a source of energy, core mantle friction, Read the Venus thread.
http://earth.myfastforum.org/The_Venus_idea_about38.html

Due to different gyroscopic properties the solid inner core of a planet has another precession logic than it's mantle causing all kinds of trouble in the fluid outer core. That's probably the singlemost underestimated feature in geophysics, IMO accountable for a lot of unexplained phenomena. The question remains how.