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Global Warming

GHGs (Greenhouse gases)


GHGs (Greenhouse Gases), with the exception of CFCs, are natural gases that absorb infrared radiation that already existed in the atmosphere before mankind. Since the Industrial Revolution and mainly due to the use of fossil fuels, nitrogen oxide and carbon dioxide emissions levels together with deforestation, have limited the regeneration ability of the atmosphere to eliminate carbon dioxide which is the main cause of global warming.

The atmosphere, as it is very transparent to visible light but much less to infrared radiation, produces on the earth surface the same effect as the glass root produces in a greenhouse; the sun’s light, which reaches the ground without great obstacles, warms it up, leading to the emission of infrared beams (calorific waves), which, unlike beams of light, are absorbed by the glass or the atmosphere and reflected again towards the surface of the earth.

These gases, having received the infrared radiation, move and generate energy as invisible and infrared beams, increasing the earth temperature.


The amount of water vapour has increased due to the increased evaporation of the seas caused by the rise in temperature. The main gas responsible for the greenhouse effect is CO2, because its emissions contribute 60%. Transport and industrial activities have raised the concentration of CO2 280 ppm (concentration at the beginning of the 20th century) to 380 ppm (at present). It comes principally from agricultural activities and other human activities. In the air it can turn into nitric acid, which causes “acid rain” and serious damage to nature and buildings. Likewise, nitrogen oxides can react with organic volatile compounds and produce what is known as the terrestrial or tropospheric ozone, harmful to health. The tropospheric ozone (terrestrial) is a dangerous toxic agent that destroys vegetable, irritates respiratory tract and turns into a greenhouse gas, unlike the Ozone in the stratosphere, which creates a protective layer against UV rays. These are the main cause of the depletion of the Ozone layer that protects us from UV rays, which are very harmful and the main cause of skin cancer.

Materiales para arquitectura activa frente al CO2

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