They are gases that trap heat in the atmosphere. The main Greenhouse gases in the atmosphere are: 

    • Carbon dioxide (CO2): through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement).
    • Methane (CH4): it is emitted during the production and transport of coal, natural gas, and oil, the activity of livestock and other agricultural practices and solid waste landfills. 
    • Nitrous oxide (N2O): It is emitted during agricultural and industrial activities, combustion of fossil fuels and solid waste, and treatment of wastewater.
    • Fluorinated gases: they are a variety of gasses emitted from a variety of industrial processes. 

Human activity is increasing the level of greenhouse gases and it is altering the balance of the atmospheric balance that make possible a stable climate. This unbalance can lead to a generally warmer climate and more frequent extreme weather events.