Ok, I see the point, but to clear it up: Stellar fusion is not the only thing that produces radiation, in the form of light and heat (IR light in this case, although even if the atmolayer reaches the sun in FE convection won't bring heat down). Light and heat are produced by lightbulbs, for one.
The sun in RE emits light across the EM spectrum, including visible light and IR light, which heats the earth. Fusion is not the one and only source.
However, fusion is the only known energy source that can provide such amounts of energy for such a long period of time from the RE sun.
Since it has been established that the FE sun cannot initiate and sustain fusion, the source of the energy must be something else, something that provides all the energy of the RE sun for a very long time. If the FE sun were chemically powered, it could not do this.
However, debate regarding the FE sun is currently housed in here.
True. You're right. However, I did not say stellar fusion is the only source that produces light and heat. Stellar fusion is a collection of nuclear reactions within the Sun; therefore, since stellar fusion is the only process that allows the Sun to produce such amount of energy and accounts for its longevity, I used the term.
Either way, Tom Bishop dodges these questions, simply because he can't answer them at all. Now I just want to see if he would come back here and redeem himself...