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

	Natural Environment
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022
Weather
Ocean / Sea
Land
Marine Mammals
Surface Waters / Wetlands
Land Mammals
Air
Plants / Kelp
Insects
Microbes
Invertebrates
Birds
Fish
	Unusual or Unexpected Event
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022
Ice / Snow Change
Extreme Temperature
Flooding / Draining
Seasonal Timing
Pollution
Permafrost Change
Extreme Precipitation
Death / Die-off / Decline
Glacier Change
Algal Bloom
Sinkhole / Crater
Erosion
Landslide / Avalanche
Rain on Snow
Unusual Animal Behavior
	Impact on Human Environment
	2011	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021	2022
Transportation
Human Health
Economic Impact
Buildings
Food Security
Cultural Impact
Sports / Recreation
Agriculture
Livestock
Safety
Energy