In fact all of the energy comes from the hydrogen store in the sun which is finite anyway. The hydrogen's consumed in nuclear fusion, light and infra red energy is released, earth is heated up, and visible light is converted into consumable energy by plants that animals eat, that are then eaten by other animals, which in turn are eaten by other animals.
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Its not just hydrogen [spoiler]helium is fused too Just less energy is converted from mass defect[/spoiler]
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I thought that helium wasn't fused until the sun swells up and becomes a red giant, engulfing us all... :/
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There is no timer in the sun saying oh its time to start fusing helium now its hot enough in the core of the sun, therefore the helium fuses
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Oh so what will cause it to swell and consume us all?
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Well not us we will be dead and forgotten but anyway they have used all the hydrogen in their core and the main area of hydrogen fusion is actually a shell around the core which has collapsed allowing the atmosphere of the sun to expand This collapsed core is helium and fusion proceeds as it would normally i believe carbon is produced If you think about it all the atoms in your body were once part of a star Unless of course you are a creationalist then your atoms which can be produced no other way than in the core of a star were dumper here in very specific quantities by a "creator"