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• Topic Timeline (Yearly)

	Natural Environment
	2010	2011	2012	2013
Atmosphere
Ocean / Sea
Weather
Land
	Unusual or Unexpected Event
	2010	2011	2012	2013
Seasonal Timing
Ice / Snow Change
	Impact on Human Environment
	2010	2011	2012	2013
Food Security
Human Health
Buildings
Sanitation
Water Security
Transportation