[–] realneil 1 point -1 points (+0|-1) ago  (edited ago)

Because it could trigger a runaway greenhouse effect. Systems tend to find a equilibrium and we are not sure where it may settle if we cause a shift. It isn't that 2 degrees is bad it is because it may lead to something like Venus.

As the modelling has shown, we just don't know.

[–] SJWs_R_FAAAGS ago 

Why you ask?

Fear.porn

[–] erivesmoi ago 

exactly