85% of U.S. GDP is not affected by climate change
U.S. has been studied more extensively.
A 2.5 to 3 degree rise in Celsius has different effects (in 1998$) according to:
Nordhaus estimates a loss of $50.3 billion .
Cline, who also sees the loss of the spotted owl, estimates $53.4 billion loss.
Fankhauser estimates $66.9 billion loss.