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 You can think of greenhouse gases as sort of a "blanket" for infrared radiation they keep the Earth's surface and lower layers of the atmosphere warmer, and the upper layers colder, than if the greenhouse gases were not there About 8090% of the Earth's natural greenhouse effect is due to water vapor and cloudsWater vapor is known to be Earth's most abundant greenhouse gas, but the extent of its contribution to global warming has been debated Using recent NASA satellite data, researchers have estimated more precisely than ever the heattrapping effect of water in the air, validating the role of the gas as a critical component of climate change The natural greenhouse effect is a phenomenon caused by gases naturally present in the atmosphere that affect the behaviour of the heat energy radiated by the sun In simple terms, sunlight (shortwave radiation) passes through the atmosphere, and is absorbed by Earth's surface This warms Earth's surface, and then Earth