Actually "the physics" changes all the time...
And unlike other fields, modest refinement in the scientific data here can create enormous shifts in predictions.
Hence the shift here from a relative warming overall... to producing pockets of severe cooling (so Gore says)
I should note, however, that the sensationalized version of Global Warming/Climate Change (the one where "run away greenhouse effects" make Earth look like a second Venus)...
Even the most ardent Climate Change scientists indicate this eventuality to be "virtually impossible".
So we can relax on the alarmism a bit. We should be good stewards of the planet...but not at the expense of mankind.