Question

what would be the average temperature at surface ,if the earth is without green house effect??

Answer 1

The temperature of earth with out green house effect is 0F or - 18c

Answer 2

if the earth is without greenhouse effect the average temperature on Earth is so low because the greenhouse gases trap the heat from the Sun if there are no greenhouse gases the height will be reflected to the atmosphere and no heat will remain on earth there will be another Ice Age again