1. a place for the burial of a corpse, esp beneath the ground and usually marked by a tombstone. 2. something resembling a grave or resting place: the ship went to its grave. 3. the grave a poetic term for death. 4. have one foot in the grave informal to be near death.
Without this greenhouse effect, the average surface temperature would be 255 degrees kelvin (-18 degrees Celsius or 0 degrees Fahrenheit); a temperature so low that all water on Earth would freeze, the oceans would turn into ice and life, as we know it, would not exist.
With no atmosphere, Venus would have a surface temperature of 130oC. With global clouds (which are present) but no greenhouse effect, Venus would have a surface temperature of minus 50oC. With global clouds and the actual greenhouse effect, Venus's real surface temperature averages at 470oC.