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

	Natural Environment
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019
Surface Waters / Wetlands
Weather
Land
Plants / Kelp
Air
Fish
Ocean / Sea
Microbes
Groundwater
	Unusual or Unexpected Event
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019
Drought
Extreme Temperature
Permafrost Change
Seasonal Timing
Erosion
Ice / Snow Change
Flooding / Draining
Earthquake
Extreme Wind
Deformity / Disease / Injury
Death / Die-off / Decline
Extreme Precipitation
Fire
Glacier Change
Pollution
Landslide / Avalanche
Thunderstorm
Sea/Land Level Change
Algal Bloom
	Impact on Human Environment
	2010	2011	2012	2013	2014	2015	2016	2017	2018	2019
Water Security
Sanitation
Buildings
Human Health
Cultural Impact
Economic Impact
Energy
Food Security
Sports / Recreation
Transportation
Agriculture
Livestock
Pets
Air Quality
Aquaculture