I knew that, what I was referring to was whether it was a natural aspect or human generated. Apparently particulate polution from Europe may have been causing severe drought in northern Africa (Sahel) several decades ago. Since it has been cleaned up the droughts have been much less severe. It will take a lot more research and data collection to answer some of these arguments.
There are so many variables with climate that we can’t control but from what I have read we do exert a very minuscule amount of influence. Whether the change with the Sahel is a result of Europe cleaning itself up or just simply fluctuations in the climate I don’t know.