Renewable energy plays a pivotal role in reducing greenhouse gas emissions from the energy sector, which remains one of the largest contributors to global climate change. The combustion of fossil fuels such as coal, oil, and natural gas for electricity, heating, and transportation releases substantial amounts of carbon dioxide, methane, and nitrous oxide into the atmosphere. By replacing these carbon-intensive fuels with renewable sources like solar, wind, hydro, geothermal, and biomass, societies can significantly decrease the volume of emissions associated with energy generation. Renewable technologies produce little to no direct greenhouse gases during operation, and their widespread adoption addresses both mitigation and adaptation objectives in combating climate change. Solar energy represents one of the most abundant and cleanest sources of power. Photovoltaic panels and concentrated solar power systems convert sunlight into electricity without emitting carbon dioxide during operation. Large-scale solar farms, as well as distributed rooftop systems, provide alternatives to coal-fired plants and reduce dependence on fossil fuels. The life-cycle emissions of solar technologies are primarily linked to manufacturing and installation, but even these are far lower than those from fossil fuel plants. As efficiency improves and production processes become greener, the carbon footprint of solar power continues to decline, enabling substantial mitigation potential. Wind energy is another cornerstone in the transition to a low-carbon energy system. Modern wind turbines harness kinetic energy from atmospheric currents and convert it into electrical power with negligible emissions once installed. Offshore and onshore wind farms have grown rapidly worldwide, supplying clean electricity to millions of households and industries. The scalability of wind energy and its relatively low operational costs make it a competitive alternative to fossil-based electricity. By displacing generation from coal and gas, wind power contributes directly to lowering overall greenhouse gas concentrations. Hydropower, especially when developed sustainably, offers significant benefits in terms of emission reduction. Large reservoirs and run-of-river installations provide dispatchable electricity with minimal operational emissions. Although certain hydropower projects can produce methane from decomposing vegetation in reservoirs, proper site selection, design, and management can mitigate these impacts. Small and micro-hydro systems, in particular, present environmentally friendly solutions for rural and off-grid communities, promoting energy access while curbing emissions. Additionally, hydropower’s capacity to balance intermittent renewable sources through storage and grid stability supports the integration of more wind and solar into the energy mix. Geothermal energy taps heat stored within the Earth to generate power and provide direct heating. Its life-cycle emissions are considerably lower than those of fossil fuels, making it an effective tool for decarbonizing electricity and heating sectors. Regions with high geothermal potential, such as Iceland, parts of the