A green job, also called a green-collar job is, according to the United Nations Environment Program, "work in agricultural, manufacturing, research and development, administrative and service activities that contribute(s) substantially to preserving or restoring environmental quality. Specifically, but not exclusively, this includes jobs that help to protect ecosystems and biodiversity; reduce energy, materials and water consumption through high-efficiency strategies; de-carbonize the economy; and minimize or altogether avoid generation of all forms of waste and pollution." (Photo: Flickr)