Recap

• Global circulation models (GCMs), developed in the 1990s, are used to make predictions and projections about the future viability of coffee farming.
• GCMs divide the world into a three-dimensional grid that extends from the bottom of the oceans up to the outer atmosphere.
• Computer processing power since the 1990s has allowed the cell sizes to become smaller, which allows for more localised predictions. 
• Where GCMs lack regional accuracy, advances in this type of technology have introduced Representative Concentration Pathways (RCPs).
• Using this technology C Bunn et al., (2014) project a 49% loss of climate-compatible land by 2050 for growing the arabica species.