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• Topic Timeline (Monthly)
• Topic Timeline (Yearly)

	Natural Environment
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Weather
Land
Surface Waters / Wetlands
Fish
Plants / Kelp
Ocean / Sea
Land Mammals
Insects
Groundwater
Birds
Marine Mammals
Invertebrates
Air
Arachnids
Microbes
Fungi
Atmosphere
Amphibians
Reptiles
	Unusual or Unexpected Event
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Ice / Snow Change
Extreme Temperature
Seasonal Timing
Death / Die-off / Decline
Permafrost Change
Rain on Snow
Erosion
Drought
Flooding / Draining
Landslide / Avalanche
Extreme Precipitation
Unusual Animal Behavior
Unusual Range / Sighting
Pollution
Deformity / Disease / Injury
Unusual Size / Abundance
Algal Bloom
Fire
Infestation
Thunderstorm
Pathogen
Storm Surge
Earthquake
Tsunami
	Impact on Human Environment
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Cultural Impact
Food Security
Economic Impact
Sports / Recreation
Human Health
Buildings
Transportation
Energy
Livestock
Pets
Water Security
Safety
Agriculture
Burial Site
Harvest Change
Fisheries
Sanitation
Displacement
Air Quality
Radiation