Why Jim Hansen Worries
Tweet Back in 1988, in the original GCM, Hansen summarized the situation going forward. Â The most important part of this figure is that grey band, and the implication that the world would soon enter that region, as indeed it has. Â The top end of the gray Eemian is well below 2 C Â pre-industrial, something that scared Hansen thirty years ago, because he knew what that meant for the world
