What would be Earth's average surface temperature if there was no greenhouse effect from water vapour and carbon dioxide? How much cooler or warmer would it be compared to the current temperature? - TL Winslow, Pansophist master of STEM and world history

https://www.quora.com/What-would-be-Earths-average-surface-temperature-if-there-was-no-greenhouse-effect-from-water-vapour-and-carbon-dioxide-How-much-cooler-or-warmer-would-it-be-compared-to-the-current-temperature/answer/TL-Winslow