Grendel wrote on Dec 2
nd, 2008 at 3:03pm:
yawn
DWMT and everyone elses... there is NO PROOF of what you believe in. Even the modelling on which your belief is based is flawed and has not as yet predicted anything accurately.
Scientists have been wrong before and I have no doubt will be wrong again. Your belief is premised on the word "likely". So much for your credibility etc. I need more than just "likely"... don't you?
Now do give it a rest.
Funny muso... but I'd have thought it was more relevant to your side of the argument. There are none so blind muso...
Guess what? I don't need a f%^&^ general circulation model to confirm that CO2 produced from the burning of fossil fuels and other anthropogenic activities is getting us into trouble.
My conclusion is not based on the word 'likely'. It's based on solid scientific principles, data and observations.
That part is easy. The difficult part comes in determining exactly how much of an effect there will be. The biggest uncertainties are in the areas of albedo effects, clouds and aerosols.
You haven't even touched on the major uncertainties. You're still talking about temperature trends.
There are huge uncertainties for the the period between now and the end of the century, because so much depends on what course of action we take. That alone can make a difference of double the atmospheric CO2 concentration.
We know there are lags - in the past with natural systems, the main driver has always been the sun, because there hasn't been anything natural in recent times that has released huge quantities of CO2 into the atmosphere. The sun
drives global temperature which increases CO2 and we get a metastable equilibrium between CO2 and temperature.
Drive it with increasing CO2 and you still get a lag. Temperature lags behind increasing CO2. It's like taking up the slack on a car towed by a rope. Eventually the rope will tighten and the global temperature will catch up. The sea temperatures have even more of a lag than atmospheric temperatures.