green-collarˌgreen-ˈcollar adjective [only before noun] 
green-collar workers have jobs making or doing things that reduce damage to the environment or damage the environment as little as possible: 
These clean energy projects could create thousands of new green-collar jobs.
green-collar workers have jobs making or doing things that reduce damage to the environment or damage the environment as little as possible: These clean energy projects could create thousands of new green-collar jobs.