What is ghg

What Are Greenhouse Gases?

Greenhouse gases (GHG) are atmospheric gases that absorb and re-emit infrared radiation, trapping heat in Earth's atmosphere. This process, called the greenhouse effect, is essential for life but becomes problematic when concentrations become excessive, leading to rapid global warming and climate change.

Primary Greenhouse Gases

The major greenhouse gases include:

• Carbon Dioxide (CO2): Released from burning fossil fuels, deforestation, and industrial processes. The most abundant anthropogenic greenhouse gas.
• Methane (CH4): Produced from livestock, landfills, rice paddies, and natural gas extraction. Much more potent than CO2 in the short term.
• Nitrous Oxide (N2O): Released from agricultural soil management, animal waste, and industrial processes. About 300 times more potent than CO2.
• Fluorinated Gases: Used in refrigeration, air conditioning, and industrial applications. Extremely potent heat-trapping gases.

Sources and Emissions

Greenhouse gas emissions come from both natural and human activities. Natural sources include ocean releases and volcanic activity. However, human activities account for the rapid increase in atmospheric GHG concentrations since industrialization. Major emission sources include:

• Energy production and electricity generation
• Transportation and vehicle emissions
• Manufacturing and industrial processes
• Agriculture and livestock farming
• Building heating and cooling
• Waste decomposition and landfills

Measuring and Reporting GHG

Scientists measure greenhouse gas emissions in carbon dioxide equivalents (CO2e) to compare the warming potential of different gases on a common scale. This allows policymakers and organizations to track and compare emissions across sectors and countries. Annual GHG inventories are compiled by nations and reported to international climate frameworks.

Climate Impact

Rising GHG concentrations have caused global average temperatures to increase approximately 1.1°C since pre-industrial times. This warming drives climate impacts including rising sea levels, changing precipitation patterns, ocean acidification, and increased frequency of extreme weather events. International efforts to reduce GHG emissions focus on transitioning to renewable energy, improving energy efficiency, and sustainable agriculture.