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• Topic Timeline (Yearly)

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