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

	Natural Environment
	2019	2020	2021	2022
Land
Weather
Surface Waters / Wetlands
Ocean / Sea
Plants / Kelp
Land Mammals
Insects
Air
Groundwater
Birds
Fish
Arachnids
Atmosphere
Invertebrates
Fungi
Amphibians
Microbes
Marine Mammals
Reptiles
	Unusual or Unexpected Event
	2019	2020	2021	2022
Extreme Precipitation
Erosion
Landslide / Avalanche
Permafrost Change
Ice / Snow Change
Extreme Temperature
Flooding / Draining
Fire
Seasonal Timing
Unusual Range / Sighting
Extreme Wind
Death / Die-off / Decline
Drought
Eruption
Storm Surge
Sinkhole / Crater
Pollution
Earthquake
Unusual Size / Abundance
Glacier Change
Rain on Snow
Sea/Land Level Change
Thunderstorm
Tsunami
Debris / Trash
Infestation
Cyclone / Hurricane
Deformity / Disease / Injury
Unusual Animal Behavior
Physical or Chemical Change
Algal Bloom
Pathogen
	Impact on Human Environment
	2019	2020	2021	2022
Buildings
Safety
Transportation
Economic Impact
Human Health
Sports / Recreation
Cultural Impact
Energy
Displacement
Agriculture
Sanitation
Food Security
Air Quality
Water Security
Livestock
Pets
Harvest Change
Burial Site
Forestry
Water Management
Fisheries
Relocation