I'm not a green pusher, but maybe consider battery powered tools? I have many 20V DeWalt tools, including a nice 3" cut off tool. My airtools are now my back ups. The batteries are very expensive, but mine are over 2 years old and still work well.
If anything the air tool is more green given the compressor doesn't have lithum batteries and the compressor and tool have EXTREMELY long lives usually.
I would buy Astro Pneumatic. So far so good on everything I have from them and the price is also very reasonable.
