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

	Natural Environment
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020
Weather
Ocean / Sea
Land
Air
Surface Waters / Wetlands
Microbes
Land Mammals
Fish
Plants / Kelp
Insects
Invertebrates
Marine Mammals
Birds
Arachnids
Reptiles
Amphibians
Fungi
	Unusual or Unexpected Event
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020
Extreme Temperature
Ice / Snow Change
Seasonal Timing
Pollution
Fire
Death / Die-off / Decline
Drought
Erosion
Unusual Range / Sighting
Deformity / Disease / Injury
Pathogen
Algal Bloom
Unusual Animal Behavior
Parasite
Extreme Precipitation
Unusual Size / Abundance
Landslide / Avalanche
Earthquake
Infestation
Extreme Wind
Flooding / Draining
Permafrost Change
Cyclone / Hurricane
Storm Surge
Tsunami
Sea/Land Level Change
Thunderstorm
	Impact on Human Environment
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020
Human Health
Buildings
Economic Impact
Transportation
Sports / Recreation
Food Security
Cultural Impact
Air Quality
Water Security
Agriculture
Sanitation
Livestock
Energy
Harvest Change
Displacement
Safety
Fisheries
Pets
Aquaculture
Burial Site
Forestry