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

	Natural Environment
	2016	2017	2018	2019	2020	2021	2022	2023	2024
Land
Air
Ocean / Sea
Atmosphere
Surface Waters / Wetlands
Birds
	Unusual or Unexpected Event
	2016	2017	2018	2019	2020	2021	2022	2023	2024
Eruption
Earthquake
Tsunami
Flooding / Draining
Glacier Change
Extreme Wind
Unusual Size / Abundance
Death / Die-off / Decline
	Impact on Human Environment
	2016	2017	2018	2019	2020	2021	2022	2023	2024
Safety
Air Quality
Transportation
Buildings
Human Health
Water Management
Sports / Recreation