Can we assume the ones in the field that originally gathered the data did it right and it was the ones at the top that sorted that into a predetermined theory are the ones the cherry picked what data was used and what was excluded?
Canada's climate holds the most interest to me at the moment and the factors point to the wind changing to blow from the south more than the west. BC should get California type weather and southern Alaska would get the weather BC is used to getting. The Rockies will see a bit of wind cross them but for the most part all the moisture will go north and be dry air by the time it reaches a northern Alaska and the -40C temps before it swings to the south and chills the warm wet air from the Gulf Stream. The winds will be quite dry by the time they get as far north as they go and then they head south and go over the UK before causing rain in Libya and Egypt, etc.
Might as play around with a model like that and see what changes would take place because of that. Example, the Mississippi flows a lot more water than it does now, enough that it flows in a straight line to the GOM. Water wheels would seem to be the way to go as far as gathering electricity over the long term. If the river basin gets more water then the drier parts of the south-west would be greener and support 2 crops per year.
Personally my favorite change would be sending all the ones 55 and older down to Mexico and let the young Mexican adults up into the places where the jobs are.
Climatologists Piece Together a Millennium of Droughts and Downpours