English PSSSB Practice 29

Greenhouse gases (GHGs) are gases in the Earth's atmosphere that trap heat, thereby warming the planet. This process, known as the greenhouse effect, is essential for maintaining temperatures that support life. However, excessive concentrations of these gases lead to global warming and climate change. The major greenhouse gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), ozone (O3), and fluorinated gases. Carbon dioxide, produced primarily through burning fossil fuels such as coal, oil, and natural gas, is the most significant greenhouse gas in terms of quantity and impact. Methane is released during the decomposition of organic matter in landfills, from livestock digestion, and rice cultivation. Nitrous oxide is emitted from agricultural soils, fossil fuel combustion, and industrial processes. Ozone in the lower atmosphere is formed by chemical reactions between pollutants from vehicles and industrial emissions. Fluorinated gases, though present in small quantities, have very high heat-trapping potential and are used in refrigeration, air conditioning, and manufacturing. Greenhouse gases trap infrared radiation emitted by the Earth, preventing it from escaping into space, thus keeping the planet warm enough for life. However, human activities since the Industrial Revolution have drastically increased their concentrations, intensifying the greenhouse effect and leading to global warming. The consequences include rising global temperatures, melting glaciers, rising sea levels, changes in precipitation patterns, increased frequency of extreme weather events, and threats to biodiversity. To mitigate these effects, international efforts such as the Kyoto Protocol and the Paris Agreement have been established to limit greenhouse gas emissions. Strategies include shifting to renewable energy sources, increasing energy efficiency, afforestation, adopting sustainable agricultural practices, and reducing waste. Public awareness and government policies are crucial for controlling greenhouse gases, as their reduction is essential for ensuring climate stability and protecting the environment. Understanding greenhouse gases and their effects is a vital step toward sustaining the Earth's ecological balance and securing a safe future for coming generations.