I use an alternative refrigerant in my own car, originally R12. I know my system has a slow leak and do not wish to spend a lot of money to constantly leak an ozone depleting chloroflourocarbon. That said I'd never use it in a customer's car. Additionally,
I use my own personal recovery and charge equipment, not the shop's.

There are good alternative refrigerants out there, problem is that Dupont has had their hand in drafting regulations for long enough now that little else besides their spendy compounds meet regulations. Here in the US at least, the rest of the world chooses refrigerants based mainly on price and efficiency, not politics.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff