Question
Discuss the contribution of renewable energy in reducing GHG emissions from energy sector.
Answer :
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The energy sector is the largest contributor to global greenhouse gas emissions, primarily due to its heavy reliance on fossil fuels such as coal, oil, and natural gas. These sources have powered industrialization and modern lifestyles but at the cost of unprecedented carbon dioxide and methane emissions. Renewable energy, by contrast, provides a pathway to decarbonize the energy sector while ensuring energy security and sustainable growth. Its role in mitigating and adapting to climate change is increasingly recognized as central to any comprehensive climate strategy. The contribution of renewable energy in reducing emissions stems from its potential to replace fossil fuel use in electricity generation, transportation, heating, and industrial activities, while also fostering systemic changes in the way societies produce and consume energy. Renewable energy sources such as solar, wind, hydro, geothermal, and biomass are characterized by their ability to generate electricity and heat with minimal direct greenhouse gas emissions. Unlike coal-fired power plants that release large amounts of carbon dioxide per unit of energy produced, renewable technologies generate power by harnessing natural flows of energy. For example, photovoltaic solar panels convert sunlight into electricity without combustion, while wind turbines capture kinetic energy without releasing pollutants. Life-cycle emissions of renewables, accounting for manufacturing, installation, and maintenance, are also significantly lower compared to fossil fuels. This shift is vital because the power sector alone accounts for about 40% of global carbon emissions, and decarbonizing it through renewables becomes a cornerstone of climate change mitigation. One of the most direct contributions of renewables lies in reducing dependence on coal, which is the most carbon-intensive fossil fuel. Transitioning to renewables in electricity generation displaces coal and natural gas plants, thereby reducing both carbon dioxide and associated pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter. For instance, studies show that solar
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