"Clean-burning" is a term used to describe a fuel or device that produces little or no harmful emissions. Synonyms for this term include eco-friendly, green, low-emission, non-polluting, and environmentally safe. These words are often used to describe alternative energy sources such as wind, solar, and hydroelectric power. In addition, they can also refer to efficient household appliances and vehicles. It's important to note that by adopting clean-burning technologies and fuels, we can help protect our environment and reduce harmful emissions that contribute to climate change. Overall, synonymizing the term "clean-burning" with these words reinforces the importance of sustainable practices in our daily lives.