Bruce
My 'back of a spreadsheet' (who uses envelopes these days?) says that 0.023 degrees is the most you'd ever get if all the energy went into the atmosphere. And clearly some goes into the sea - think of all that cooling water that gets pumped out. So I don't think a 2.3 degree rise a century is anywhere near a real case - just a theoretical top limit. The other thing, (and its late here and I'd need to think this through clearly when I'm awake) is that using renewables such as solar/tidal you are just capturing and concentrating energy that was coming to the earth anyway from solar radiation. So I'm not sure you'd get a net warming from those sources that you do from a fossil fuel plant. I'm not sure about nuclear - I think a nuclear plant just concentrates the decay that's already going on?!

There really are some fascinating discussions on this 'music forum'!
KP