In the last decades, great interest has been focused on developing innovative, efficient and eco-friendly methods for the reduction of carbon dioxide (CO₂). The use of ultrasound (sonochemistry) has appeared as one of these techniques, thanks to its operational simplicity (working at ambient conditions), safety and being environmentally benign (in general, no need for chemical additives). To date, several works have been dedicated to the sonochemical and sono-assisted carbon dioxide reduction, where various operating conditions were analyzed. The present review aims at analyzing the multiple works focusing on the sonochemical and sono-assisted reduction of carbon dioxide. Through these works, the mechanism of CO₂ sono-reduction, its limitations and probable solutions are discussed. Additionally, the combination of sonolysis with other technological techniques (absorption, adsorption, photocatalysis, photolysis, electrochemistry, etc.) has been analyzed with a demonstration of the promising solutions of each of these methods. In addition, theoretical works focusing upon sono-decomposition of CO₂ inside the acoustic bubble are also discussed. Finally, future directions and perspectives have been proposed for more improvement of the available techniques or for the creation of plausible hybrid methods. To the best of our knowledge, this is the first literature review addressing the CO₂ reduction by ultrasound.

在过去的几十年中，人们的极大兴趣一直集中在开发用于减少二氧化碳 (CO ₂ ) 的创新、高效和环保的方法上。由于其操作简单（在环境条件下工作）、安全性和对环境无害（通常不需要化学添加剂），超声（声化学）的使用已成为这些技术之一。迄今为止，已经有几项工作致力于声化学和声波辅助二氧化碳还原，其中分析了各种操作条件。本综述旨在分析以声化学和声波辅助还原二氧化碳为重点的多项工作。通过这些工作，CO _2的机理讨论了声波减少、其局限性和可能的​​解决方案。此外，还分析了声解与其他技术技术（吸收、吸附、光催化、光解、电化学等）的结合，并展示了每种方法的有希望的解决方案。此外，还讨论了以声泡内CO _{2的声波分解为重点的理论工作。}最后，已经提出了未来的方向和观点，以进一步改进可用技术或创建合理的混合方法。据我们所知，这是第一篇关于通过超声波减少CO _{2的文献综述。}