What would earth’s temperature be without the greenhouse effect?

the global temperature would be minus 19 degrees celsius.
the greenhouse effect does not affect global temperatures; it only has local effect.
without the greenhouse effect, the earth’s temperature would hover just above freezing the entire year.
without the greenhouse effect, the earth’s temperature would reach 26.6 degrees celsius (80 degrees fahrenheit).
without the greenhouse effect, the north and south poles would disappear.