The greenhouse effect is originally a natural phenomenon: a certain number of gases naturally present in the atmosphere absorb part of the heat emitted by the Earth. However, as a result of human activities, the concentration of some of these gases increases, which reinforces the natural greenhouse effect. In addition, man has also created synthetic substances which in turn cause a (powerful) greenhouse effect.
Water vapor (H2O) the most important greenhouse gas naturally present in the atmosphere
is created by the evaporation of water present on the surface of the Earth
created in large quantities as a result of human activities, mainly: energy production by burning fossil fuels (coal, oil and natural gas), deforestation, especially in tropical regions, for the conversion of forests into agricultural land, industrial processes such as cement and lime production
Methane is a powerful greenhouse gas, mainly from the decomposition of organic matter from agriculture and landfills, as well as natural gas extraction and distribution
the emissions of this greenhouse gas resulting from human activities come from: use of fertilizers containing nitrogen), the chemical industry, burning fossil fuels for home heating and transportation
