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In the greenhouse effect, Far infrared radiation is emitted by the Earth's surface and absorbed and re-emitted by greenhouse gases in the atmosphere. These gases are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and water vapor (H2O). The concentration of these gases has significantly increased over the past century due to human activities, such as burning fossil fuels, deforestation, and industrial processes. This increase in greenhouse gas concentration has resulted in a stronger greenhouse effect and subsequent global warming.