Before revision: At the end of Snowball Earth, before the equilibrium "thermostat" between volcanic activity and the by then slowly resuming chemical weathering was reinstated, CO in the atmosphere had accumulated enough to cause temperatures to peak to as much as 60 °C before they eventually settled down .
After revision: At the end of Snowball Earth, before the equilibrium "thermostat" between volcanic activity and the by then slowly resuming chemical weathering was reinstated, CO in the atmosphere had accumulated enough to cause temperatures to peak to as much as 60 °C , thrusting the Earth into a brief moist greenhouse state .