No I've not dyed my hair green! I like my hair the way it is, long and brown with a touch of auburn. No the green is environmentally friendly! Haircare is probably for a lot of women pretty environmentally damaging with all the chemicals in shampoos and conditioners, the electricity for the hairdryer. These things can be bad for the hair too.
I wash my hair when it needs it, if I washed it too much the ends would dry and break. I use Yaoh shampoo and conditioner, which are made from 99% pure natural ingredients and the couple of artificial ingredients in there don't include such baddies as parabens and sodium lauryl sulphate. I let my hair dry naturally, I haven't had a hairdryer for 20 years.
I cut my own hair and have never dyed it or had highlights. I would consider using henna when I go grey, but it would depend how I went grey, sometimes grey hair can look really beautiful. I will eventually wear my hair shorter, but that's several years in the future.
Hair for Sunday Scribblings