This expanded on the last idea but after reading https://www.scientificamerican.com/article/splitting-carbon-dioxide/ about how you can turn CO2 into oxygen and fuel. This is done by passing the gas through high powered lasers, This separates CO2 molecules to O2 and CO, if you add water (which is also in your breath) you can make a biofuel. I thought to moving this technology into a wind instrument. This way the environment is being saved (slightly) and you have music.