Capt. Smithy.......you sure you want to satisfy this request ?!
Hmm, one thinks that gathering empirical data on that experiment might be somewhat difficult.
Not to mention waiting for the ideal conditions.
In seriousness however I think it is almost impossible to make any judgments with respect to Wx/Climate and the effects of emissions (or a lack of) since there are so many variables involved. Volcanic eruptions, gas being released from the oceans, plants, etc. all make a contribution which at the moment cannot be accurately measured. We can theorise and guess all we want at how much CO2 or any other trace gas for that matter a volcano releases into the atmosphere for example but the fact is we cannot make any measurement at all on how much is actually being emitted. It is impossible.
Added to that Wx is never a perfect constant, trying to draw any sort of comparison is a statistician's nightmare...
Smithy