What are greenhouse gases?
A greenhouse gas (GHG) is in the atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. There are six mainly potential greenhouse gases, that are Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs) and Sulphur hexafluoride (SF6).
What is the greenhouse effect?
An atmospheric heating phenomenon, caused by short-wave solar radiation being readily transmitted inward through the earth’s atmosphere but longer-wavelength heat radiation less readily transmitted outward, owing to its absorption by atmospheric carbon dioxide, water vapor, methane, and other gases; thus, the rising level of carbon dioxide is viewed with concern.
Natural vs. Human Enhanced Greenhouse Effect
Naturally, greenhouse effect keeps the average temperature at the Earth’s surface warm and stable. However, human activities – mainly the burning of fossil fuels and deforestation – have greatly intensified the natural greenhouse effect, as called global warming.