If the greenhouse effect just elevated the temperature increase by the same number of points that it does now, the temperature would be around 539°C.
Some light cannot leave the Earth due to the absorption of light by greenhouse gas molecules in the atmosphere. The planet's average temperature rises as a result of the atmosphere being warmer.
For decades, the amount of carbon dioxide in the Earth's atmosphere has been steadily increasing, which traps more heat close to the surface and raises temperatures.
Sunlight heats the Earth's surface, and some of this energy is radiated back into space as infrared radiation. Unlike visible light, this radiation tends to be absorbed by the atmosphere's greenhouse gases, increasing the temperature of the atmosphere.
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