• # question_answer The reason for global warming is A)  Long wavelength radiation are absorbed by the atmosphere B)  Short wavelength radiation are-absorbed by the atmosphere C)  Atmosphere traps radiations to increase the temperature D)  UV and infrared radiations

[a] Greenhouse gases, such as methane $(C{{H}_{4}}),$nitrous oxide $({{N}_{2}}O),$ water vapour $({{H}_{2}}O)$ and carbon dioxide $(C{{O}_{2}}),$ absorb certain wavelengths of OLR adding heat to the atmosphere, which in turn causes the respective absorbing layer of the atmosphere to emit more radiation. Some of this radiation is directed back towards the Earth, increasing the average temperature of the Earth's surface. Therefore, an increase in the concentration of a greenhouse gas would contribute to global warming by increasing the amount of radiation that is absorbed and emitted by these atmospheric constituents.