The strong greenhouse effect in the early Earth could have resulted from accumulation in the atmosphere of CO2 emitted by volcanoes. Imagine an Earth initially covered by ice. Why volcanic CO2 would accumulate in the atmosphere under such conditions? - TL Winslow, Pansophist master of STEM and world history

https://www.quora.com/The-strong-greenhouse-effect-in-the-early-Earth-could-have-resulted-from-accumulation-in-the-atmosphere-of-CO2-emitted-by-volcanoes-Imagine-an-Earth-initially-covered-by-ice-Why-volcanic-CO2-would-accumulate-in-the/answer/TL-Winslow