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ATMOSPHERE (DEFINITION (The atmosphere is the layer of gases around the…

- - - - In the cities there are lots of sources of pollutants: central heating, some factories... but the most important one is usually the traffic. Cars, trucks, buses and other vehicles produce lots of chemical substances. Some are very dangerous for human health
    - - GREENHOUSE EFFECT
        
        We can find a small proportion of carbon dioxide in the atmosphere. It isn't harmful for humans but it has an effect on the Earth's temperature: 1.-Carbon dioxide (CO2) is a “greenhouse effect gas”. This means that this gas permits sunlights to go through the atmosphere. 2.-The sunlight in the ground increases its temperature. 3.-When the temperature of the ground increases it produce a different type of radiation: infrared radiation. 4.-Greenhouse effect gasses are not transparent to infrared radiation so they "catch" it. The heat is not able to go out the atmosphere so it rebounds heating the Earth again.
      - GLOBAL WARMING
        
        Due to the presence of these excess of greenhouse effect gases produced artificially by human action there are temperatures is increasing too much. As the process is happening all around the world we call it global warming. Mainly, it's produced by human activity and an increase of 0.1ºC could make huge changes in the Earth conditions.
      - CLIMATE CHANGE
        
        As the temperature increases, all the rest of the climatic conditions change (rainfall,humidity,winds...). An increase of 2ºC in the temperatures produces changes in all the climatic conditions and also in other important issues such as an important rise of the sea level. We are not able to predict the exact changes in climate, but most of the models let us think of changes that are leading to more extreme climatic conditions (more draughts, more tornados, more floods... conditions which are going to be dangerous for most people).