Greenhouse Gases
Greenhouse gases are atmospheric compounds that absorb and re-emit infrared radiation, trapping heat within Earth’s atmosphere. This natural greenhouse effect is essential for maintaining temperatures suitable for life. However, industrial activities and human development have significantly increased concentrations of these gases since the pre-industrial era, intensifying the effect and causing global temperatures to rise.
Primary Greenhouse Gases
The main greenhouse gases contributing to climate change are carbon dioxide (CO₂), methane (CH₄), nitrous oxide (N₂O), and fluorinated gases such as hydrofluorocarbons (HFCs). Carbon dioxide, released primarily through fossil fuel combustion and deforestation, accounts for the largest share of radiative forcing. Methane, produced from livestock agriculture, fossil fuel extraction, and waste decomposition, is significantly more potent at trapping heat over shorter timeframes. Nitrous oxide, released from agricultural and industrial sources, has a longer atmospheric lifespan and greater warming potential than CO₂.
Impacts on Air Quality and Climate
Elevated greenhouse gas concentrations contribute to both long-term climate change and localized air quality degradation. The trapping of heat alters weather patterns, increases the frequency of extreme weather events, and disrupts ecosystems. Additionally, some emissions associated with greenhouse gases—particularly from fossil fuel combustion—also produce particulate matter and other pollutants that directly harm air quality and human health.