What is "green" about a curved approach? It appears they may have some limited applicability to airports that currently have marginal clearance over straight-in approach corridors but have better clearance otherwise. Otherwise, a curved approach would have the airplane in a constant bank, which will ADD TO fuel burn! Also, reduced wings-level time on final approach will significantly reduce safety margins.
The claims are interesting, too. What makes uplinked winds any better than real-time winds calculated by the airplane's FMS and INS?
Once again, what is the allowable trade-off in CO2 and noise vs injuries and deaths?
BTW, "idling" final approaches are also prohibited in jet airplanes for safety reasons...