THAT one is green
I agree. I hadn't bothered to look before I spouted.
You will note that the greenish tones are best towards the limb of the planet where bluish clouds and atmosphere help the oranges blend to green.
In the centre of the planet, the dark dust is a much bluer grey.
Overall, I suspect that the colours have been pushed too far in this Hubble image. Mars is a much more boring tan than this lurid orange.