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

	Natural Environment
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Weather
Land
Ocean / Sea
Air
Surface Waters / Wetlands
Plants / Kelp
Atmosphere
	Unusual or Unexpected Event
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Extreme Precipitation
Ice / Snow Change
Extreme Wind
Flooding / Draining
Extreme Temperature
Fire
Permafrost Change
Earthquake
Eruption
Pollution
Unusual Range / Sighting
Erosion
Storm Surge
Landslide / Avalanche
Cyclone / Hurricane
	Impact on Human Environment
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Transportation
Buildings
Human Health
Sanitation
Energy
Safety
Air Quality
Economic Impact
Agriculture
Displacement
Livestock
Pets