I think we need to get away from the whole global warming thing. Instead, we should be focused on mitigating global climate change. A multitude of inputs, some feedbacks are involved in the climate system. Reducing CO2 emissions is only one step. Reducing the loss of biomass through deforestation is another. Reducing wastage is paramount as well.
Too many things we can possibly do to help rather than just focussing on emissions only.
Climate change is real, and it is now having an impact on coffee production, and not in a good way.