Quote:
Originally Posted by dgavin
If you want to debunk the Sun is warming up the planet argument, you simply need to reverse the Energy/Dist = Temperatue logic to find out what a 1.8 degree change on earth due to suns output would mean.
I think you would find that by revering this would lead one to mathmatical conclusion the sun has started moving into the red giant phase, which we know it has't done yet.
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Its not that simple. If you try that calculation for the current solar flux to try to find the temp of the Earth, you dont get the current temp of the Earth. If I remember right, the Earth is a good deal warmer.
Another way to see that your arguement dosent work is that there should be a good clear monotonic temp bias to take into account the brightness increase of the sun over the last couple billion years. If you actually check the temps tho, you find that the Earth is colder now than it has been over large periods in the past.
The effect of solar radiation on Earth's temp is a very complex one.
One thing tho, my comment above has to do with the fact that whatever is causing the current climate change dosent change the fact that 99% of the heat on the Earth's surface is from solar radiation.