World climate researchers say that global warming is happening due to the increase of polluting gases, especially the ones resulted from fossil fuel firing (gasoline, diesel, etc.), in the atmosphere. Those gases (ozone, carbon dioxide, methane and, mainly, carbon monoxide) form a polluting layer, of difficult dispersion, which cause the famous greenhouse effect. This phenomenon happens because the gases absorb great part of the infrared radiation emitted by the planet, making heat difficult to disperse.

Deforestation and burning forests also collaborates in the process. Sunrays reach the soil and irradiate heat in the atmosphere.  As the polluting layer turns heat dispersion more difficult, the result is an increase of global temperature.  Although this phenomenon is most evident in the big cities, its consequences are already felt in a global level.

Global warming consequences

• Raise of the oceans level: with the increase in the world’s temperature, the polar ice caps are melting. With the raising of the oceans, many coastal cities might eventually be submerged;
• Creation and growth of deserts: the increase in temperature provokes the death of many animal and vegetable species, unbalancing various ecosystems.  Added to deforestation, especially in tropical countries (Brazil, African countries), the tendency is to more and more expand the desert regions of planet Earth;
• Increase in the number of hurricanes, cyclones, and tornados: the warm temperature causes more evaporation from the oceans, potentizing this kind of climate catastrophe;

Waves of heat: areas where the climate used to be temperate have suffered with waves of heat. European summers, for instance, have had heat so intense as to cause infant and elder deaths.