Renewable energy sources, including solar, wind, hydropower, and bioenergy, offer substantial benefits for mitigating greenhouse gas emissions and reducing dependency on fossil fuels. However, their environmental impact varies based on factors such as resource type, geographic location, and energy production methods. This report examines the sustainability dimensions of renewable energy, analyzing both their advantages and the environmental challenges they pose. Key issues addressed include resource efficiency, ecological footprint, biodiversity impact, waste management, and land use. Special focus is given to evaluating lifecycle emissions, water consumption, and materials required for renewable technologies. For instance, solar panels and wind turbines have a positive role in reducing carbon emissions, but they also require substantial energy for production, and their disposal can lead to environmental degradation if not managed sustainably. The sustainability of renewables hinges not only on their carbon offset potential but also on their long-term ecological impacts. This report highlights strategies and best practices for reducing negative environmental impacts, such as circular economy principles, improved recycling methods, and optimized land use. It concludes by suggesting policy recommendations and technological innovations that support a sustainable transition to a low-carbon future.