has subject area Arctic Regions Carbon Ecological and Environmental Phenomena - Permafrost Ecological and Environmental Phenomena - Permafrost Ecological and Environmental Phenomena - Rivers Elements - Mercury Environment and Public Health - Permafrost Environment and Public Health - Permafrost Environment and Public Health - Rivers Environmental Exposure - Environmental Monitoring Geographic Locations - Oceans and Seas Geological Phenomena - Oceans and Seas Geological Phenomena - Permafrost Geological Phenomena - Rivers Metals - Mercury Public Health Practice - Environmental Monitoring Seawater - Oceans and Seas Transition Elements - Mercury Water Pollutants, Chemical Yukon Territory