That decision sidesteps the requirement to use R1234yf, made by Honeywell and Dupont.

And he demaunded yf the passyons came to all men.

But not all advocates see HFO-1234yf as the solution.

R1234yf by contrast has a GWP of just four.

Daimler indicated that the new research does not alter its stance against the use of HFO-1234yf.