Greenhouse gas

Greenhouse gases (GHGs) are the gases in an atmosphere that trap heat, raising the surface temperature of astronomical bodies such as Earth. Unlike other gases, greenhouse gases absorb the radiations that a planet emits, resulting in the greenhouse effect. The Earth is warmed by sunlight, causing its surface to radiate heat, which is then mostly absorbed by greenhouse gases.

Without greenhouse gases in the atmosphere, the average temperature of Earth's surface would be about −18 °C (0 °F), rather than the present average of 15 °C (59 °F).
Human-induced warming has been increasing at an unprecedented rate since it has started being measured, reaching 0.
27±0.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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