Well I won't bore you with the gory details; but
iceball earth is a crazy construct of Trenberth's equally crazy cartoon of Earth's energy balance.
John Barrow and Frank Tipler's Anthropic Cosmological Principle (1984) provides plenty of material SF readers / writers... including anthropic climate - sensitivities spanning the range from -100 °C (
iceball Earth) to +200 °C (furnace Earth).
Interesting, but what does this imply about the temperatures in
iceball earth eras and the forcings needed to escape therefrom?
Not exact matches
If it wasn't for the warming effect of carbon dioxide, the
Earth would've been a frozen
iceball throughout much of its history.
«It simply impossible to have the entire surface of the
earth covered with ice with solar radiation at today's levels, even starting with an
iceball with no CO2.
Things like assumptions about linearity (which means more or less, they make the mistake of assuming that all forcings and feedbacks operate at similar ratios and strengths when the planet is an
iceball as they do when
Earth hits a rare warm phase).