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Called greenhouse gases (GHG) those whose presence in the atmosphere contribute to the greenhouse effect  (a phenomenon whereby certain planetary atmosphere component gases retain part of the energy that the ground emits heated by solar radiation). Its atmospheric concentration is low, but they are crucial in raising the air temperature next to the ground, making it stay in a range of values suitable for the life existence on the planet.

The most important greenhouse gases are: carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), CFCs (CFC) and ozone (O3).