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• Topic Timeline (Yearly)

Natural Environment

Atmosphere		1
Land		1
Ocean / Sea		1
Surface Waters / Wetlands		1
Weather		1

Unusual or Unexpected Event

Extreme Temperature		2
Ice / Snow Change		2
Permafrost Change		1
Seasonal Timing		1

Impact on Human Environment

Economic Impact		2
Transportation		2
Cultural Impact		1
Food Security		1
Buildings		1

Year