The atmosphere has been filled with carbon dioxide, methane and nitrous oxide.
The gaseous blanket surrounding the atmosphere has been thickened. (Greenhouse effect)
The Earth's heat is trapped in the atmosphere, increasing the Earth's temperature.
The rapid increase in the temperature will cause dangerous alterations to the weather and the global climate:
LONG PERIODS OF DROUGHTS
Desertification
Forests will be destroyed
Sahara will enlarge and reach Italy and Spain
The Nile delta will disappear
Water shortages
PROLONGED HEAVY PRECIPITATIONS
STORMS/TORNADOES/HURRICANES
floods