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

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