With the first one, I think it's quite long at 24 characters, also hyphenated, so not huge value imo. Also i'm not sure if the singular, rather than consultancy/consultants affects the value. The plural version is also on Sedo & seems to be getting some traffic, so may make a little on parking.
Here's a couple of similar that are free to reg(not that they are worth anything!):
GreenConsultant.co.uk
EnvironmentConsultants.co.uk
Possibly more potential with GreenOils but don't know anything about that market...