Sometimes the synergistic and antagonistic effects are visible, but it is hard to segregate and natural and anthropogenic causes of climate change related effects.
Ever heard of the IPCC report? The encyclopedia for your question
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http://www.ipcc.ch/report/ar5/wg1/#.UxzqbrmYbIU
Emmm ... sounds like the only way to do this is via comprehensive numerical modeling exercises. I am wondering if there is anyway to do this via empirical approaches?
Pleas have a look at other questions in this topic of climate change here at ResearchGate, like this one:
Do you think the climate change has only to do with human society or is it also occuring "naturally"?
check the model outputs with natural forcings, GHG forcings and all forcings, and them do attribute detection study...
There are two experiments in CMIP5 which do not include anthropogenic effects: the pre-industrial control experiment ("piControl") and the Last Millenium experiment ("past1000"). The latter is 1000 years long and includes variability in solar forcing and aerosols from volcanoes as the only variable external forcings. The simulations cover the period from 850 to 1850.
Details about the design of experiments and their focus can be found in this paper:
Taylor KE, Stouffer RJ, Meehl GA (2012) An overview of CMIP5 and the experiment design. Bull Am Meteorol Soc 93(4):485–498
The data is freely available. You need to register as a user, but otherwise free. Go to:
http://cmip-pcmdi.llnl.gov/cmip5/
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