Knowing such studies must surely exist, I google, and find an article that says, "The greenhouse effect is well-established science, and experiments that demonstrate the effect on a lab scale are common to the point that they are often presented in science fairs."
So, you've got greenhouse gases in the air in large amounts as a result of fossil fuels. I reason that they probably are in larger amounts than we would find going back in history. Cars and factories cover the earth, emitting the gases continuously and voluminously. Could there ever have been so many fires or so many volcanoes or could there ever have been a set of conditions that caused greenhouse gases in the amounts we are now seeing?
Well, perhaps.
But, the fact remains that the greenhouse gases we now are experiencing demonstrably do raise the temperature. Regardless whether there have been other factors during the history of the earth that also spiked the temperature, this one, too, is real. And, an over abundance of fires and volcanoes would have went away on their own good time, this is a factor that will not go away unless we do something about it.
Also note this: Regardless whether you can prove the earth's temperature was rising long before our carbon emissions came along, our carbon emissions did come along, and the effect of their coming along is rising temperatures. Science is not ambiguous on this. Your proving that the earth's temperature is rising naturally does not disprove that carbon chemicals also cause it to rise.
I think we should keep this in mind as we debate climate change. Perhaps we can question whether the change is enough to cause damage, but I don't know that we can question whether the climate is being warmed by fossil fuels.
http://physics.stackexchange.com/questions/29200/what-experiments-prove-the-greenhouse-effect
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