Peter Sinclair writes at Climate Denial Crock of the Week:
… Read the rest
The story of “snowball earth” has been distorted and used as confusion fodder by climate denial luminaries like His Celestial Magnanimity, the looney “Lord” Monckton, – see above.(starts about 1:50)
In contrast to today, when warming from our industrial injection of carbon dioxide into the atmosphere threatens life on the planet, in the deep past, CO2 pulled planet earth from a permanent, deathly world-wide deep freeze, maybe more than once. In both cases, it’s those same heat-trapping properties that made the difference.
It’s all more evidence of how co2 has acted as the planet’s “biggest control knob” for temperature over 4 billion years.
The idea of a deep-frozen world, “snowball Earth”, has captured the imagination since first proposed in the 1990s. On several occasions in history, long before animals evolved, apparently synchronous ice sheets existed on all the continents.