The problem with greenhouse gases, as I understand it, is that they absorb and emit radiation within the thermal infrared range leading to increased temperatures on Earth. According to some sources, there appears to be a large gap with lower atmospheric opacity for wavelengths between 10cm and 10m. Can we not convert significant amounts of thermal infrared radiation to longer wave radiation in an efficient way (especially since it is lower entropy)? I understand the radiation is pretty spread out, but couldn't we expel thermal radiation from volcanos or industry that way?