> The entire biosphere (forests, forest-dwelling animals, ocean life, the crops > we grow, us) as well as most human infrastructure rests on an equilibrium so > precarious that a couple degrees in mean temperature change is going to have > first, second and third order effects we can barely predict. No one and nowhere > will be “sheltered” in any broad sense.

This is complete speculation. And the annual variation in temperature of ~50 degrees C many places on earth, does not really support it.