Martin, in the past they were Game Wardens and there job was checking you and me for a hunting and fishing license every now and then. Now our "game Wardens" spend more than 50% of their time monitoring air pollution, water run-off, land fills and toxic waste sites, petroleum and chemical storage. Hence the name Environmental Police. Many years ago they were their own separate entity but now they all go to the Trooper Academy and have become Environmental Troopers. It's very similar to the show Alaska State Troopers but the En Con Officers here get a different uniform.