Answer :

The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth, some of this energy is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases in the atmosphere. This re-radiation helps to keep the Earth’s surface warmer than it would otherwise be.

To determine how much cooler the Earth would be without the greenhouse effect, we rely on scientific studies and climate models. These have estimated that the greenhouse effect warms the Earth by approximately 33 degrees Celsius (which is roughly 60 degrees Fahrenheit).

Therefore, without the greenhouse effect, the Earth would be about 60 degrees Fahrenheit cooler.

The answer is:
- 60 degrees F