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Greenhouse effect Noun phenomenon where gases allow sunlight to enter Earth's atmosphere but make it difficult for heat to escape greenhouse gas Noun gas in the atmosphere, such as carbon dioxide, methane, water vapor, and ozone, that absorbs solar heat reflected by the surface of the Earth, warming the atmosphere solar energyGlobal warming is the increase in the Earth's average atmospheric temperature over a long period of time, generally due to increased levels of greenhouse gases caused by human activities Scientists believe that even a 23ºF (0611°C) increase in the average temperature of the Earth could trigger disastersThe diagram gives more details about this process, called the greenhouse effect How the greenhouse effect works Electromagnetic radiation at most wavelengths passes through the Earth's atmosphere Creating A Greenhouse Effect Diagram Global warming greenhouse gases diagram