The best replacement for green gas is co2.

The best alternatives to green gas are rated as following:
★★★★★  co2
★★★★  propane
★★★  red gas
★★★  propane airsoft
★  aeg
★  134a
★  c02
★  co2 airsoft guns
★  top gas
★  co2 guns
★  hfc134a
  co2 airsoft
  duster
  co2 airsoft pistol
  co2 gas
  hfc 134a
  c02 airsoft pistol

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Google Trends

Scale is based on the average worldwide traffic of green gas in all years. Click on graph for more.
green gas
co2
propane