Found this explanation a while back
Why is the earth's core so hot? And how do scientists measure its temperature?
I really like some of it, and plan to dissect it, and try to propose ways of testing the hypothesis.
Also my explanation needs fixing up (when I get the chance)
Selfishness is the gateway to Self Destruction
Lack of "Wokeness" is to be reincarnated as a tapeworm, whereas more awareness give rise to higher level feelings and relations with others