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

	Natural Environment
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Land
Ocean / Sea
Surface Waters / Wetlands
Weather
	Unusual or Unexpected Event
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Earthquake
Fire
Tsunami
Erosion
Ice / Snow Change
Permafrost Change
	Impact on Human Environment
	2012	2013	2014	2015	2016	2017	2018	2019	2020	2021
Buildings
Sanitation
Safety
Transportation
Air Quality
Displacement
Cultural Impact
Energy