Unknown: "Please cite any definitive study that proves the causality of global warming." Those who understand the scientific process know that science never 'proves' anything. 

Instead science offers hypotheses to explain observations. Scientists then make predictions based on the best hypotheses. If another hypothesis comes along that better explains the data, then that hypothesis is accepted.  Right now the hypothesis that human-caused greenhouse gases are causing climate distruptions explains the data very well. If you have a better hypothesis (which I doubt), please share it.