The article discusses the urgent need for transitioning towards sustainable energy systems to combat the rising greenhouse gas emissions from fossil fuels. It highlights the significance of strategies like waste heat recovery (WHR) in improving the efficiency of power plants and reducing emissions. The integration of carbon capture and storage (CCS) with renewable energy sources is identified as a promising approach to enhance efficiency and lower operational costs by converting CO2 into valuable products. Methanol production is crucial in this transition, with a focus on low-carbon methods like power-to-methanol technologies. Geothermal energy, spanning a wide temperature range, is recognized as a sustainable resource with applications in electricity generation and thermal processes. The article also presents a study on a system that captures CO2 from waste-to-energy flue gases to produce methanol and liquefied CO2, showcasing a reduction in greenhouse gas emissions compared to traditional methods. Overall, the article emphasizes the importance of sustainable energy solutions for a cleaner and more efficient energy future.