Okay folks, half of the Earth’s heat energy is now unaccounted for. Careful measurement has eliminated a lot of the uncertainty in our calculations and we now know that the only understood heat source is good for half of the observed output. Primordial heat sounds good and is plausibly the heat of Newtonian assemblage which is still far too little and has likely long ago been largely dissipated.
So we now have a real problem in explaining the source of all that heat. I will step beyond that. There is little evidence of decay either as we peer backwards in geological time. We are producing heat and it appears almost sustainable.
This discrepancy is so huge no hand wave will postpone its confrontation. So long as we were unable to properly account for the nuclear component, that hand wave stood.
My first thought and it would be since I have a unique perspective on particle physics, is that we may well be working here with dark energy provided that dark energy is capable of reacting and producing heat.
Better still, we have the Rossi Focardi reactor to inform us. It is nickel based and it engages in fusion reactions quite able to produce the heat. Since we can now do just that in the lab with at least a fifteen times unity heat production, it is obvious that exactly this form of heat generation is a plausible candidate.
Quite simply, in terms of popular jargon, the heat deficit is made up by ‘cold fusion’ which has now been definitively demonstrated.