Adjective
green collar (comparative more green collar, superlative most green collar)
Alternative form of green-collar
Of or pertaining to employment in the environment or environmentalism industries.
Of or pertaining to rural, agricultural employment; often contrasted with urban blue-collar employment.
Source: en.wiktionary.orggreen-collar
Recycling is an area where jobs could be created at low cost. Green collar workers. That's not very sexy. Geoff Mulgan