What Was a Key Finding of the 2007 Stern Report

What was a key finding of the 2007 Stern Report in the United Kingdom on the Economics of Climate Change?

A) The costs of extreme weather over the next few decades could reach 0.5% to 1% of world GDP per annum.
B) Climate change should promote forced savings over the next few decades.
C) Climate change bears little, if any correlation to economic disruption.
D) The costs of extreme weather over the next few decades could reach 10% to 15% of world GDP per annum.