Paul D... As a part - time alarmist I would answer that with a little bit of
extrapolation added to some warnings of climate scientists I guess the worst case scenario at least includes the total collapse of the WAIS, creating tsunamis at least all
over the Pacific rim, the subsequent
sea level rise of c. 7m will destroy most of the remaining harbours, communication centers near coasts, next up would be the melting of the collapsed
ice in the southern ocean altering the climate of the entire southern hemisphere, making it near - impossible to guess what areas are good for similar agriculture as before, leading to massive movements of people.
However the model structure, assumptions, and data assimilation methods, whatever their uncertainties and differences, are better than
extrapolation or kriging
over long distances or across land /
sea /
ice boundaries.